Which of the following statements concerning the scaling of muscle properties with body size istrue?A. Muscle mass scales isometrically with body mass.B. A small animal can lift a greater load relative to its body mass than a larger animal.C. The force generated by a muscle is proportional to its cross-sectional area.D. A large animal will be able to carry a greater mass than a smaller animal.E. All of the above are true

The muscle tissue is made up of cells that have the ability to contract which in turn aids various…

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Biology

Which of the following statements concerning the scaling of muscle properties with body size is true?

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 11RE

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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

Which of the following statements concerning the scaling of muscle properties with body size is
true?
A. Muscle mass scales isometrically with body mass.
B. A small animal can lift a greater load relative to its body mass than a larger animal.
C. The force generated by a muscle is proportional to its cross-sectional area.
D. A large animal will be able to carry a greater mass than a smaller animal.
E. All of the above are true

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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.
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.
Which of the following statements relating to the factors affecting the force of muscle contraction is false? a. skeletal muscles contract strongest when the muscle fibers are 80-120% their resting length b. low frequency of stimulation generates decreased force c. larger muscle fibers can generate more tension to generate stronger contractions d. more motor units recruited causes stronger contractions e. none of the above
Which of the following is true? A. Muscle fibers either will contract with all the force possible under existing conditions or will not contract at all. B. Skeletal muscles can contract with varying degrees of strength given different circumstances. C. Muscle length does not have an effect on contractile strength. D. Metabolic condition of the myocyte does not have an effect on contractile strength.
Why might multiple, small motor units be advantageous over a single large motor unit? A. They enable finer control over movements. B. Small motor units contract more rapidly than large motor units. C. Small motor units have greater capacity for strength improvement. D. The strength of contraction can be modulated more easily in small motor units. E. They enable a strong, flexing motion.
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.
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.
With regard to muscle contraction, which of the following is an INCORRECT statement with regard to the interactions of filaments that occur in the sarcomere? A. When muscles are relaxed tropomyosin blocks binding sites on actin subunits, which keeps cross-bridges from forming. B. The myosin heads conduct a power stroke motion to slide when bound to actin, to move the "thin" filaments towards the center of the sarcomere. C. During contraction, actin subunits are removed from the ends of the "thin" filaments to shorten actin polymers, thus reducing the length of the sarcomere. D. "Thick" filaments are anchored at the M-line, while "thin" filaments are anchored at the Z-line. E. Numerous myosin heads engage with the actin filaments simultaneously, such that there is no back-slipping during the contraction process.
contraction occurs as the length of the muscle increases. a. Concentric O b. Eccentric O c. Static O d. None of these In regard to the force-length relationship, it is true that: a. The muscle length at which maximal active force occurs is called optimal length b. Total force is equal to the sum of active and passive force C. All of these d. Beyond resting length, passive force increases from short to long muscle lengths
Which of the following statements about the connective sheath of skeletal muscle is false? a. the endomysium wraps around every single muscle fiber b. the perimysium wraps around groups of muscle fibers c. the epimysium wraps around the whole muscle organ d. all of the above e. none of the above
The functions of tropomyosin in skeletal muscle include A. releasing calcium ions after initiation of contraction. B. generating ATP which it passes to the contractile mechanism. C. binding to myosin during contraction. D. acting as a relaxing protein at rest by covering up the sites where myosin binds to actin. E. sliding on actin to produce shortening.
Which of the following statements is FALSE regarding skeletal muscle contraction? O a. Calcium binds troponin specifically on a calcium binding site which then leads to tropomyosin movement O b. The action potential of a motor nerve is transmitted to a muscle fibre through the neuromuscular junction which is a fusion of nerve and muscle cell membranes O c. Fine motor movement/control is a result of recruiting smaller motor units O d. Calcium is pumped into storage soon after it is released to the cytoplasm