Muscle tone is the small amount of tautness or tension in the muscle due to weak, involuntary contractions of its motor units.A muscle that is lengthening while it produces tension is performing a(n) ____ contraction. eccentric. When muscle tension develops but the load is not moved. Isometric Contraction. Determined by alternating motor units of a muscle organ even when the muscle is at rest. Muscle Tone.Eccentric contractions. Eccentric (lengthening) actions are characterized by elongation of the muscle during active contraction. 122 Over the last fifteen years, eccentric exercises have been promoted as treatment strategies for tendinopathies and muscle strains, especially for the lower limb (quadriceps and Achilles tendinopathy). Greater forces can be produced during eccentric contractionContractions that permit the muscle to shorten are referred to as concentric contractions. An example of a concentric contraction in the raising of a weight during a bicep curl. In concentric contractions, the force generated by the muscle is always less than the muscle's maximum (P o).Types of Muscle Contraction: An isotonic concentric contraction results in the muscle shortening, an isotonic eccentric contraction results in the muscle lengthening. During an isometric contraction the muscle is under tension but neither shortens nor lengthens.
Muscles and Muscle Tissue Flashcards | Quizlet
The longer a muscle is when it starts contracting, the more tension it can generate in the contraction.B A muscle that is lengthening while it produces tension is performing a(an) _____ contraction. A) eccentric Binding of calcium to calmodulin is a step in excitation-contraction coupling of _____ cells. B) smooth muscle What specific neurotransmitter is released from the axonal terminus via exocytosis acetylcholine When muscle cells break downAn eccentric (lengthening) muscle contraction occurs when a force applied to the muscle exceeds the momentary force produced by the muscle itself, resulting in the forced lengthening of the muscle-tendon system while contracting (Lindstedt et al., 2001).An eccentric or braking contraction is an interesting but routine type of muscularThe tension generated by the contraction activates the golgi tendon organ (see section Proprioceptors), which inhibits contraction of the muscle via the lengthening reaction (see section The Lengthening Reaction).
Muscle Isotonic Contraction - an overview | ScienceDirect
During isotonic, eccentric contractions, muscle lengthens as it generates tension, but not enough force, to overcome the load. We use eccentric contractions to lower objects (such as lowering a book from the shelf or lowering the barbell during a bench press). The force of a muscle contraction is NOT affected by __________.The tension in the cross-bridges (the portion of myosin filament that pulls the actin filaments toward the center of the sarcomere during muscle contraction) is equal to the resistive force, thereby maintaining constant muscle length. Concentric muscle contraction is muscle shortening as the muscle produces tension while the insertion movesAn eccentric contraction occurs as muscle tension diminishes and a muscle lengthens. This type of contraction is observed when the same hand weight is lowered in a slow and controlled manner by the biceps brachii. An isometric contraction occurs when a muscle produces tension without a change in muscle length.An eccentric muscle action occurs when a muscle develops tension while lengthening. The muscle lengthens because the contractile force is less than the resistive force. Isometric or static muscle action (contraction) Isometric contraction occurs when the muscle develops tension but does not change in length.Length-Tension Relations. Let's do an experiment using the gastrocnemius muscle of a frog to examine the relationship between resting muscle fiber length and contraction.
Take Quiz Which of the following is CORRECTLY paired?
A. cardiac muscle: nonstriatedB. easy muscle: striatedC. skeletal muscle: voluntary controlD. cardiac muscle: voluntary control
C. skeletal muscle: voluntary keep watch over
What reasons the release of calcium from the terminal cisternae of the sarcoplasmic reticulum inside a muscle cellular?A. arrival of an motion potentialB. troponinC. calcium ion pumpD. ATP
A. arrival of an action possible
The binding of calcium to which molecule reasons the myosin binding sites to be uncovered?A. tropomyosinB. troponinC. actin
B. troponin
A myosin head binds to which molecule to form a cross bridge?A. troponinB. actinC. tropomyosin
B. actin
What reasons the myosin head to disconnect from actin?A. binding of ATPB. binding of calciumC. hydrolysis of ATPD. binding of troponin
A. binding of ATP
What energizes the facility stroke?A. hydrolysis of ATPB. calciumC. binding of ATP
A. hydrolysis of ATP
In a neuromuscular junction, synaptic vesicles within the motor neuron comprise which neurotransmitter?A. norepinephrineB. serotoninC. acetylcholine (ACh)D. dopamine
C. acetylcholine (ACh)
When an motion potential arrives on the axon terminal of a motor neuron, which ion channels open?A. voltage-gated calcium channelsB. chemically gated calcium channelsC. voltage-gated sodium channelsD. voltage-gated potassium channels
A. voltage-gated calcium channels
What means of membrane transport is used to release the neurotransmitter into the synaptic cleft?A. a channelB. exocytosisC. a protein carrier
B. exocytosis
The binding of the neurotransmitter to receptors at the motor end plate reasons which of the next to occur?A. Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate.B. Binding causes chemically gated potassium channels to open within the motor end plate.C. Binding causes voltage-gated sodium channels to open within the motor endplate.D. Binding reasons potassium voltage-gated channels to open within the motor endplate.
A. Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate.
How is acetylcholine (ACh) removed from the synaptic cleft?A. a reuptake pump on the axon terminalB. acetylcholinesterase (AChE; an enzyme)C. diffusion clear of the synaptic cleft
B. acetylcholinesterase (AChE; an enzyme)
The action doable on the muscle cellular results in contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cellular?A. T tubuleB. cytosolC. terminal cisternae of the sarcoplasmic reticulumD. sarcolemma
C. terminal cisternae of the sarcoplasmic reticulum
Excitation-contraction coupling is a series of events that occur after the occasions of the neuromuscular junction have transpired. The term excitation refers to which step within the process?A. Excitation refers back to the shape exchange that occurs in voltage-sensitive proteins in the sarcolemma. B. Excitation refers back to the launch of calcium ions from the sarcoplasmic reticulum. C. Excitation, in this case, refers to the propagation of action potentials alongside the sarcolemma. D. Excitation refers to the propagation of action potentials alongside the axon of a motor neuron.
D. Excitation refers back to the propagation of action potentials along the axon of a motor neuron.
Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. What particular match initiates the contraction?A. Voltage-sensitive proteins exchange form.B. Sodium launch from the sarcoplasmic reticulum initiates the contraction.C. Calcium launch from the sarcoplasmic reticulum initiates the contraction.D. Action potentials propagate into the interior of the skeletal muscle fiber.
C. Calcium launch from the sarcoplasmic reticulum initiates the contraction.
A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are those parts hooked up?A. Myosin cross-bridge binding sites.B. Potassium leak channels.C. A sequence of proteins that control calcium release.D. Voltage-gated sodium channels.
C. A chain of proteins that regulate calcium launch.
What is identify given to the frequently spaced infoldings of the sarcolemma?A. transverse or T tubulesB. sarcoplasmic reticulumC. motor endplatesD. terminal cisternae
A. transverse or T tubules
Which of the next is maximum directly liable for the coupling of excitation to contraction of skeletal muscle fibers?A. Calcium ions. B. Acetylcholine. C. Action potentials. D. Sodium ions.
A. Calcium ions.
What is the connection between the collection of motor neurons recruited and the collection of skeletal muscle fibers innervated?A. Motor neurons all the time innervate hundreds of skeletal muscle fibers.B. Typically, hundreds of skeletal muscle fibers are innervated via a unmarried motor neuron.C. A skeletal muscle fiber is innervated via more than one motor neurons.D. A motor neuron in most cases innervates just one skeletal muscle fiber.
B. Typically, masses of skeletal muscle fibers are innervated via a unmarried motor neuron.
Excitation-contraction coupling comprises all EXCEPT which of the next events?A. propagation of an action attainable alongside the sarcolemma and down T tubulesB. binding of calcium ions to troponin, which removes the blockading motion of tropomyosinC. launch of acetylcholine from axon terminals on the neuromuscular junctionD. release of calcium ions from the terminal cisterns
C. release of acetylcholine from axon terminals on the neuromuscular junction
What is a go bridge cycle?A. It is the cycle through which the sarcolemma is many times depolarized and repolarized.B. It is a cycle of repeated stimuli leading to summation of muscle twitches.C. It is the cycle in which motor gadgets are recruited from small to very large, with a purpose to produce slow increases in drive.D. It is the cycle during which an energized myosin head binds to actin and performs a energy stroke, then binds to ATP in an effort to detach and re-energize.
D. It is the cycle through which an energized myosin head binds to actin and plays a energy stroke, then binds to ATP in order to detach and re-energize.
Muscle tissue does NOT ________.A. produce movementB. generate heatC. produce blood cellsD. handle postureE. stabilize joints
C. produce blood cells
Which type of muscle CANNOT contract with out being stimulated through the apprehensive gadget?A. skeletalB. cardiacC. smoothD. visceral
A. skeletal
Which muscle characteristic describes the ability of muscle to respond to a stimulus?A. excitabilityB. contractilityC. extensibilityD. elasticity
A. excitability
Action attainable propagation in a skeletal muscle fiber ceases when acetylcholine is got rid of from the synaptic cleft. Which of the next mechanisms guarantees a rapid and efficient elimination of acetylcholine?A. Acetylcholine diffuses away from the cleft.B. Acetylcholine is transported into the postsynaptic neuron by way of receptor-mediated endocytosis.C. Acetylcholine is degraded through acetylcholinesterase.D. Acetylcholine is transported back into the axon terminal by means of a reuptake mechanism.
C. Acetylcholine is degraded by acetylcholinesterase.
The neuromuscular junction is a well-studied example of a chemical synapse. Which of the next statements describes a critical match that happens on the neuromuscular junction?A. Acetylcholine binds to its receptor within the junctional folds of the sarcolemma. Its receptor is related to a G protein.B. Acetylcholine is released through axon terminals of the motor neuron.C. Acetylcholine is launched and moves around the synaptic cleft certain to a transport protein.D. When the action potential reaches the top of the axon terminal, voltage-gated sodium channels open and sodium ions diffuse into the terminal.
B. Acetylcholine is launched via axon terminals of the motor neuron.
Action potentials travel the period of the axons of motor neurons to the axon terminals. These motor neurons __________.A. lengthen from the spinal cord to the sarcolemma of a skeletal muscle fiberB. stand up within the epimysium of a skeletal muscle and prolong to person skeletal muscle fibersC. lengthen from the brain or spinal wire to the sarcolemma of a skeletal muscle fiberD. prolong from the brain to the sarcolemma of a skeletal muscle fiber
C. prolong from the mind or spinal wire to the sarcolemma of a skeletal muscle fiber
Calcium access into the axon terminal triggers which of the following events?A. Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine.B. Cation channels open and sodium ions input the axon terminal while potassium ions go out the axon terminal.C. Acetylcholine is launched into the cleft through lively transporters in the plasma membrane of the axon terminal.D. Acetylcholine binds to its receptor.
A. Synaptic vesicles fuse to the plasma membrane of the axon terminal and launch acetylcholine.
Acetylcholine binds to its receptor within the sarcolemma and triggers __________.A. the hole of voltage-gated calcium channelsB. the hole of calcium-release channelsC. the hole of ligand-gated cation channelsD. the opening of ligand-gated anion channels
C. the outlet of ligand-gated cation channels
Sodium and potassium ions do not diffuse in equivalent numbers through ligand-gated cation channels. Why?A. The within floor of the sarcolemma is negatively charged in comparison to the out of doors floor. Sodium ions diffuse inward alongside favorable chemical and electrical gradients.B. The inside floor of the sarcolemma is negatively charged in comparison to the out of doors surface. Potassium ions diffuse inward along favorable chemical and electrical gradients.C. The outside floor of the sarcolemma is negatively charged in comparison to the interior surface. Sodium ions diffuse outward along favorable chemical and electric gradients.D. The out of doors surface of the sarcolemma is negatively charged in comparison to the inside surface. Potassium ions diffuse outward along favorable chemical and electric gradients.
A. The inside of floor of the sarcolemma is negatively charged in comparison to the out of doors floor. Sodium ions diffuse inward along favorable chemical and electric gradients.
The pass bridge cycle is a series of molecular occasions that happen after excitation of the sarcolemma. What is a go bridge?A. Troponin sure to tropomyosinB. A myosin head sure to actinC. ATP sure to a myosin headD. Calcium certain to troponin
B. A myosin head sure to actin
What construction is the functional unit of contraction in a skeletal muscle fiber?A. The sarcomereB. The triadC. The pass bridgeD. The junctional folds of the sarcolemma
A. The sarcomere
Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored inside the fiber?A. Calcium ions are stored in the mitochondria.B. Calcium ions are saved within the sarcoplasmic reticulum.C. Calcium ions are saved in the transverse tubules.D. Calcium ions are saved in the nuclei.
B. Calcium ions are saved in the sarcoplasmic reticulum.
After a power stroke, the myosin head should detach from actin earlier than any other power stroke can occur. What reasons move bridge detachment?A. Calcium ions bind to troponin.B. ADP and inorganic phosphate are bound to the myosin head.C. Acetylcholine binds to receptors in the junctional folds of the sarcolemma.D. ATP binds to the myosin head.
D. ATP binds to the myosin head.
How does the myosin head obtain the power required for activation?A. The energy comes from oxidative phophorylation.B. The energy comes from the hydrolysis of GTP.C. The power comes from the direct phosphorylation of ADP through creatine phosphate.D. The energy comes from the hydrolysis of ATP.
D. The power comes from the hydrolysis of ATP.
What explicit match triggers the uncovering of the myosin binding web site on actin?A. Calcium release channels open in the sarcoplasmic reticulum, and calcium levels upward thrust in the sarcoplasm.B. Sodium ions bind to troponin and change its shape.C. Calcium ions bind to tropomyosin and change its form.D. Calcium ions bind to troponin and change its form.
D. Calcium ions bind to troponin and alter its form.
When does go bridge biking end?A. Cross bridge cycling ends when calcium launch channels within the sarcoplasmic reticulum open. B. Cross bridge biking ends when calcium ions are passively transported back into the sarcoplasmic reticulum.C. Cross bridge cycling ends when sufficient calcium has been actively transported back into the sarcoplasmic reticulum to allow calcium to unbind from troponin. D. Cross bridge cycling ends when ATP binds to the myosin head.
C. Cross bridge biking ends when sufficient calcium has been actively transported again into the sarcoplasmic reticulum to allow calcium to unbind from troponin.
In the determine above, which structure corresponds to a unmarried skeletal muscle cell?A. BB. AC. DD. C
D. C
The connective tissue that covers structure A is steady with which of the following?A. tendonB. sarcolemmaC. endomysiumD. ligament
A. tendon
Which structure corresponds to a single fascicle?A. AB. BC. CD. D
B. B
Which of the following is the smallest structural unit in which the distinctive striated bands feature of skeletal muscle are seen?A. DB. AC. CD. B
A. D
The smallest contractile unit inside of skeletal muscle would correspond to the gap between which two points within the determine?A. Three and 5B. 1 and 7C. 2 and 6D. 1 and three
B. 1 and seven
Between which two issues would there be really extensive amounts of each the proteins actin and myosin?A. 2 and 3B. 1 and 2C. Three and 5D. None of the listed responses is right kind.
A. 2 and three
The area between which two issues corresponds to the I band?A. Three and 5B. 2 and 5C. 2 and 3D. None of the indexed responses is proper.
D. None of the listed responses is correct.
What cell tournament is indicated through A?A. facilitated diffusionB. energetic transportC. endocytosisD. exocytosis
D. exocytosis
What match immediately triggers the discharge of neurotransmitter proven in A?A. diffusion of Ok+ into the axonal terminusB. diffusion of Na+ out of the axonal terminusC. diffusion of Ca2+ into the axonal terminusD. diffusion of Na+ into the axonal terminus
C. diffusion of Ca2+ into the axonal terminus
What specific neurotransmitter is released from the axonal terminus as shown in A?A. myosinB. calciumC. actinD. acetylcholine
D. acetylcholine
Which statement accurately describes the event indicated via B?A. Diffusion of Ca2+ into the muscle fiber triggers the diffusion of acetylcholine out of the muscle fiber.B. Binding of acetylcholine to a receptor triggers the opening of an ion channel.C. Diffusion of acetylcholine into the muscle fiber triggers the outlet of an ion channel.D. Diffusion of acetylcholine into the muscle fiber triggers the diffusion of Ca2+ out of the muscle fiber.
B. Binding of acetylcholine to a receptor triggers the outlet of an ion channel.
Which tournament is most vital in initiating the "wave of depolarization" proven in match C?A. diffusion of Na+ into the muscle fiberB. diffusion of K+ out of the muscle fiberC. diffusion of acetylcholine down the length of the muscle fiberD. diffusion of acetylcholine into the muscle fiber
A. diffusion of Na+ into the muscle fiber
The protein actin is indicated wherein letter?A. AB. BC. CD. D
A. A
Which protein is indicated by means of E?A. actinB. troponinC. tropomyosinD. myosin
D. myosin
The molecular interplay described as a "cross bridge" involves the binding of which two of the letters underneath?A. B and DB. A and CC. A and BD. A and D
B. A and C
Which lettered protein functions as a motor protein?A. CB. AC. DD. B
A. C
The protein troponin is proven in this determine to be certain to which substance?A. calcium ionB. sodium ionC. acetycholineD. myosinA. calcium ion
In which section in the determine would the net movement of Ca2+ into the sarcoplasmic reticulum (SR) be biggest?A. AB. BC. C
C. C
Which of the following is true in regards to the anatomy of a skeletal muscle fiber?A. A triad consists of a T tubule and the close by sarcolemma.B. Myofibrils include thick and skinny filaments.C. The sarcolemma is the muscle fiber's cytoplasm.D. T tubules are extensions of the sarcoplasmic reticulum.
B. Myofibrils include thick and thin filaments.
The calcium that initiates skeletal muscle contraction is released from what construction(s)?A. sarcolemmaB. terminal cisternaeC. T tubulesD. sarcomeres
B. terminal cisternae
Which of the next are composed of myosin?A. thick filamentsB. thin filamentsC. tropomyosinD. intermediate filaments
A. thick filaments
In muscle fibers, which regulatory protein blocks the attachment of myosin heads to actin?A. thick filamentsB. tropomyosinC. acetylcholinesteraseD. calcium
B. tropomyosin
What event most immediately triggers the release of calcium from the terminal cisternae?A. motion of tropomyosin clear of the lively websites on actinB. move bridge formation between the thick and skinny filamentsC. action potential propagating toward the axon terminalD. action potential propagating down the T tubule
D. motion doable propagating down the T tubule
How do calcium ions initiate contraction in skeletal muscle fibers?A. Calcium ions provide the power essential for the myosin head power stroke.B. Calcium ion motion depolarizes the sarcolemma on the synaptic cleft.C. Calcium ions bind to troponin, converting troponin's form.D. Calcium ions bind to tropomyosin, exposing the active websites on actin.
C. Calcium ions bind to troponin, changing troponin's form.
Which of the next best possible describes the occasions of "excitation" in "excitation-contraction coupling"?A. movement of tropomyosin away from the active sites on actinB. propagation of the action doable alongside the sarcolemmaC. launch of calcium from the terminal cisternaeD. move bridge formation
B. propagation of the action possible alongside the sarcolemma
Which of the following highest describes the events of "contraction" in "excitation-contraction coupling"?A. launch of calcium from the terminal cisternaeB. cross bridge formationC. propagation of the action attainable alongside the sarcolemma of the muscle fiberD. sliding of myofilaments
B. cross bridge formation
Isometric contraction ends up in motion of a load. True or FalseTrue False
False
Thick myofilaments are fabricated from ________.A. myosinB. tropomyosinC. troponinD. actin
A. myosin
Which pathway for regenerating ATP provides the majority of the power used for muscle task right through half-hour of sunshine to moderate exercise?A. cardio respirationB. use of saved ATPC. anaerobic glycolysisD. direct phosphorylation of ADP by means of creatine phosphate
A. cardio respiratory
The type of muscle found in the partitions of most hollow organs is ________.A. skeletal muscleB. cardiac muscleC. unitary clean muscleD. multi unit easy muscle
C. unitary clean muscle
A muscle that is lengthening while it produces tension is performing a(an) ________ contraction.A. isometricB. maximalC. eccentricD. concentric
C. eccentric
The first step toward generating a skeletal muscle contraction is ________.A. binding of the myosin heads to actinB. stimulation of the muscle by way of a nerve endingC. binding of ATP to the myosin headsD. a upward thrust in intracellular Ca2+ ranges
B. stimulation of the muscle by means of a nerve finishing
Which muscle fiber sort is easiest fitted to endurance actions, similar to long-distance jogging?A. speedy oxidative fibersB. speedy glycolytic fibersC. gradual glycolytic fibersD. slow oxidative fibers
D. sluggish oxidative fibers
What is the type of chemical reaction used to rebuild ADP into ATP?A. dehydration synthesisB. hydrolysisC. rehydration synthesis
A. dehydration synthesis
Which of the next processes produces molecules of ATP and has two pyruvic acid molecules as finish merchandise?A. hydrolysis of creatine phosphateB. Krebs cycle and oxidative phosphorylationC. glycolysis
C. glycolysis
Which of the following processes produces 36 ATP?A. Krebs cycle and oxidative phosphorylationB. glycolysisC. hydrolysis of creatine phosphate
A. Krebs cycle and oxidative phosphorylation
The "rest and recovery" period, the place the muscle restores depleted reserves, comprises the entire following processes EXCEPT __________.A. Oxygen rebinds to myoglobin.B. Pyruvic acid is transformed again to lactic acid.C. ATP is used to rephosphorylate creatine into creatine phosphate.D. Glycogen is synthesized from glucose molecules.
B. Pyruvic acid is transformed back to lactic acid.
Which type of muscle fiber has a huge amount of glycogen and principally makes use of glycolysis to synthesize ATP?A. white rapid twitch fibers B. purple sluggish twitch fibers
A. white speedy twitch fibers
In which phase of the muscle twitch shown in the above figure would the maximum amount of ATP be ate up by way of myosin head groups?A. BB. CC. A
A. B
When muscle cells damage down glucose to generate ATP underneath oxygen poor prerequisites, they're going to shape ________.A. glucoseB. fatty acidsC. lactic acidD. glycogen
C. lactic acid
The power of a muscle contraction is NOT affected by __________.A. the selection of muscle fibers stimulatedB. the frequency of the stimulationC. the dimensions of the muscle fibers stimulatedD. the degree of muscle stretchE. the volume of ATP stored within the muscle cells
E. the quantity of ATP stored in the muscle cells
Cross bridge formation between myosin heads and actin molecules is caused through the elevation of calcium ion focus within the cytosol. During rigor mortis, this elevation of calcium ion concentration within the cytosol is everlasting because ________.A. mitochondria prevent generating ATP molecules required by means of the sarcoplasmic reticulum's calcium ion pumpsB. troponin molecules bind irreversibly to calcium ions to forestall them from being got rid of from the cytosolC. tropomyosin molecules bind irreversibly to calcium ions to stop them from being removed from the cytosolD. acetylcholine continues to stimulate the release of calcium ions from the sarcoplasmic reticulum
A. mitochondria prevent generating ATP molecules required via the sarcoplasmic reticulum's calcium ion pumps
The sliding filament style of contraction states that ________.A. throughout contraction the skinny myofilaments slide past the thick myofilaments so that calcium ions may also be launched from the sarcoplasmic reticulumB. right through contraction the skinny myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments not overlapC. throughout contraction the skinny myofilaments slide past T tubules so that the Z discs are overlappingD. right through contraction the skinny myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater stage
D. all through contraction the skinny myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a larger level
The distance between Z discs ________ right through muscle contraction.A. increasesB. decreasesC. decreases and then increasesD. remains the similar
B. decreases
Which protein inhibits interaction between actin and myosin to stop skeletal muscle contraction; and which ions remove the inhibition?A. tropomyosin; calcium ionsB. myosin; sodium ionsC. troponin; sodium ionsD. actin; calcium ions
A. tropomyosin; calcium ions
The response of a motor unit to a unmarried action doable of its motor neuron is called ________.A. a muscle twitchB. recruitmentC. wave summationD. a tetanic contraction
A. a muscle twitch
What result can be expected if an additional stimulus, equal in intensity to the primary, have been to be carried out to the muscle at the 60 millisecond (ms) time level?A. Tension would building up to the similar maximum pressure measured originally of segment C.B. The muscle would quickly return to the absolutely comfortable state of minimal tension.C. The muscle would increase in tension to a level more than that measured at the start of phase C.D. The tension exerted via the muscle would proceed to decrease, but at a considerably slower price than seen with out the second one stimulus.
C. The muscle would building up in tension to a stage greater than that measured originally of phase C.
Slow oxidative muscle fibers are very best suited for ________.A. running a marathonB. operating a 100-yard dashC. hitting a baseballD. lifting heavy weights on the health club
A. working a marathon
Choose the FALSE remark.A. Skeletal muscle cells have glycosomes.B. Skeletal muscle cells use creatine phosphate as a substitute of ATP to do paintings.C. Skeletal muscle cells have T tubules.D. Skeletal muscle cells are multinucleated.E. Skeletal muscle cells contain myoglobin.
B. Skeletal muscle cells use creatine phosphate as a substitute of ATP to do paintings.
What particular function of smooth muscle lets in it to stretch without immediately leading to a sturdy contraction?A. stress-relaxation responseB. low energy requirementsC. sluggish, prolonged contractile activityD. clean muscle tone
A. stress-relaxation response
The smallest contractile unit of a muscle fiber is ________.A. the elastic filamentB. troponinC. the sarcomereD. the myofilament
C. the sarcomere
Cardiac muscle makes most of its ATP by the use of anaerobic pathways. True or FalseTrue False
False; aerobic
Binding of calcium to calmodulin is a step in excitation-contraction coupling of ________ cells.A. smooth muscleB. skeletal muscleC. cardiac muscleD. cardiac and visceral clean muscle
A. clean muscle
Smooth muscle tissues are able to regenerate all the way through existence. True or FalseTrue False
True
Which of the next is TRUE?A. Skeletal muscle fibers have a tendency to be shorter than clean muscle fibers.B. Skeletal muscle fibers contain sarcomeres; clean muscle fibers don't.C. Skeletal muscle cells have one nucleus, but smooth muscle cells are multinucleated.D. Skeletal muscle lacks the coarse connective tissue sheaths that are found in clean muscle.
B. Skeletal muscle fibers comprise sarcomeres; smooth muscle fibers do not.
Which of the next elements influence the velocity and duration of muscle contraction?A. duration of muscle fibers activatedB. frequency of stimulationC. load positioned at the muscleD. muscle fiber size
C. load positioned at the muscle
The major function of the sarcoplasmic reticulum is to keep an eye on ________.A. intracellular ranges of Na+B. extracellular levels of Ca2+C. extracellular levels of Na+D. intracellular ranges of Ca2+
D. intracellular ranges of Ca2+
A&P In Class 12 - Anatomy & Physiology 1131 with Paul at ...
A&P In Class 12 - Anatomy & Physiology 1131 with Paul at ...
A&P In Class 12 - Anatomy & Physiology 1131 with Paul at ...
A&P In Class 12 - Anatomy & Physiology 1131 with Paul at ...
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