Human Biology : Concepts and Current Issues - With Access
7th Edition
ISBN: 9780321874856
Author: Johnson
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 10TY
Which of the following is/are characteristic of slow-twitch fibers?
a. large amounts of glycogen storage
b. myoglobin content enables oxygen storage
c. numerous mitochondria
d. both (b) and (c)
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Students have asked these similar questions
All of the following characteristics apply to skeletal muscle except
a. They are striated.
b. They are multinucleated.
c. They are voluntary.
d. They contain intercalated discs.
e. They are attached to the skeleton by means of tendons.
If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.
a)Less tension would be created.
b) No difference in tension creation.
c) More tension would be created.
d) No tension would be created.
When sarcomeres contract during muscle contraction, which of the following occurs?
A.
The myosin filaments lengthen.
B.
The myosin filaments "walk" along the actin microfilaments.
C.
The myosin filaments shorten.
D.
The actin filaments shorten.
Chapter 6 Solutions
Human Biology : Concepts and Current Issues - With Access
Ch. 6 -
1. Do you think we should continue to try to...Ch. 6 - Prob. 2QCCh. 6 - Describe how muscle contraction can resist...Ch. 6 - Describe how a muscle's origin and insertion...Ch. 6 - Describe the roles of calcium in muscle...Ch. 6 -
4. Explain what causes rigor mortis.
Ch. 6 - Prob. 5CRCh. 6 - Prob. 6CRCh. 6 - Prob. 7CRCh. 6 -
8. Compare and contrast how a constant degree of...
Ch. 6 - Prob. 9CRCh. 6 - Prob. 10CRCh. 6 - Prob. 1TYCh. 6 -
2. Which of the following choices arranges the...Ch. 6 - All of the following are functions of the muscular...Ch. 6 -
4. Which of the following happens during muscle...Ch. 6 -
5. Botulism toxin inhibits the release of...Ch. 6 - The sliding filament mechanism describes the...Ch. 6 -
7. What is the first and most direct energy...Ch. 6 - As you clasp your hands in front of you and push...Ch. 6 -
9. All of the following may happen in response to...Ch. 6 - Which of the following is/are characteristic of...Ch. 6 - Which of the following is the site of calcium ion...Ch. 6 - What is the role of ATP in muscle function? a. ATP...Ch. 6 -
13. Which of the following would have motor units...Ch. 6 - Which type(s) of muscle cells can contract the...Ch. 6 - Prob. 15TYCh. 6 - Why do you think it is generally accepted medical...Ch. 6 - Prob. 2AWKCh. 6 - What would happen to a muscle if one of its...Ch. 6 - Prob. 4AWKCh. 6 - Prob. 5AWKCh. 6 - Prob. 6AWKCh. 6 - Prob. 7AWK
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- ___ fibers can temporarily store ___ in myoglobin. a. Fast-twitch . . . ATP b. Slow-twitch . . . oxygen c. Fast-twitch . . . oxygen d. Fast-twitch . . . calciumarrow_forwardMuscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forwardWhich of the following statements is true?a. Fast fibers have a small diameter.b. Fast fibers contain loosely packed myofibrils.c. Fast fibers have large glycogen reserves.d. Fast fibers have many mitochondriaarrow_forward
- which of the following statement is true? a. Fast fibers have difficulty fatiguing b. Fast fibers have large glycogen reserves c. Fast fibers containe loosely packed myofibrils d. Fast fibers have a small diameterarrow_forwardHow would muscle contractions be affected if skeletalmuscle fibers did not have T-tubules?arrow_forwardWhich is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.arrow_forward
- A bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle. Consequently, a. the skeletal muscle contracts with increasing force. b. the skeletal muscle contracts with increasing frequency. c. the ability to stimulate the muscle is impaired. d. other neurotransmitters would stimulate the muscle.arrow_forwardWhich statement about striated skeletal muscle is true? A. The tension generated by a muscle is invariable. B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch. C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch. D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials. E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.arrow_forwardGraph A in this diagram represents A) summation and tetanus of a smooth muscle fibre. C) a simple skeletal muscle twitch c) summation and tetanus of a skeletal muscle fibre. D)simple smooth muscle twitch.arrow_forward
- Which of the following causes ( the state of ) rigor in skeletal muscle ?a) lack of atp b) decrease of intracellular ca2plus c) increase in intracellular ca2+ d) lack of action potential in motor neuronsarrow_forwardDuring a single muscle twitch, the sarcomeres within a muscle contract maximally. How can you explain the difference in the force generated (and the amount of finger movement) when only the frequency was increased?arrow_forwardName three differences between slow-twitch and fast-twitch muscle fibers.arrow_forward
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