Answered: In an isometric contraction, the muscle…

In an isometric contraction, the muscle develops tension but does not: a. Expend energy. b. Exhibit elasticity. c. Lengthen. d. Conduct electrical current. e. Widen

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2RE

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

Question

In an isometric contraction, the muscle develops tension but does not:

a. Expend energy.
b. Exhibit elasticity.
c. Lengthen.
d. Conduct electrical current.
e. Widen

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When a muscle is fully stretched, which of the following statements is true (check all that apply). Select one or more: a. No tension can be generated. b. Both contractile and elastic forces generate tension. c. The actin and myosin filaments cannot interact. d. No developed or contractile tension can be generated. e. Passive or elastic forces generate tension.
When muscle fibers are stimulated so frequently they do not have an opportunity to relax, they are experiencing: a. unfused or incomplete tetanus. b. wave summation. c. fused or complete tetanus. d. twitch.
Put the following skeletal muscle contraction events in the order that they occur: a. The myosin head swivels toward the center of the sarcomere. b. Calcium ions are released from the sarcoplasmic reticulum and bind to troponin. c. An action potential is propagated along the sarcolemma and transverse tubules. d. Myosin binds to actin, forming crossbridges. e. Myosin heads bind ATP molecules and release from actin. f. Tropomyosin molecules are moved off active sites on actin. g. ATPase splits ATP, providing the energy to reset the myosin head.
Which of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.
The series-elastic component of muscle contraction is responsible for a.increased muscle shortening to successive twitches. b.a time delay between contraction and shortening. c.the lengthening of muscle after contraction has ceased. d.all of these.
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The ability of a muscle to generate tension immediately after stimulation is dependent on: a. myosin interaction with the M line b. overlap of myosin and actin c. actin attachments to the Z line d. none of the above
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Which of the following effects result(s) from aging on the muscular system?a. Muscle mass declines.b. Slow-twitch fibers are affected most by aging.c. Fatigue occurs more quickly.d. Increased muscle tone limits stability.e. The gait lengthens and is slower.
Which of the following statements is not characteristic of smooth muscles? a.Myosin phosphatase is required for contraction. b.They are able to conduct graded depolarizations. c.They can enter a latch state. d.They can produce graded contractions in response to graded depolarizations.
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During muscle contraction, the I band a. hides the H zone. b. shortens or narrows. c. overlaps the Z line. d. always remains the same length.