Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134312729
Author: Johnson
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 9TY
All of the following may happen in response to exercise training except:
a. increase in the number of myofibrils
b. increase in the storage of glycogen and creatine phosphate
c. increase in the number of muscle fibers
d. increase in the number of mitochondria
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Which 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 mitochondria
What happens to sarcomeres when actin and myosin filaments in a muscle fiber interact during the contraction phase?
A) sarcomeres usually fatigue
B) sarcomeres usually get shorter
C) sarcomeres usually get longer
D) sarcomeres stay the same
During a concentric contraction of a skeletal muscle fiber, myofibrils a. lengthen. b. remain the same length. c. increase in diameter. d. shorten.
Chapter 6 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
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 - Prob. 1AWKCh. 6 - Why do you think it is generally accepted medical...Ch. 6 - Prob. 3AWKCh. 6 - What would happen to a muscle if one of its...Ch. 6 - Prob. 5AWKCh. 6 - Prob. 6AWKCh. 6 - Prob. 7AWKCh. 6 - Prob. 8AWK
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- Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_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_forwardWhy 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.arrow_forward
- 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.arrow_forwardWhen 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.arrow_forwardAs a result of a resistance training program from your exercise prescription, the client demonstrates improved Muscular Fitness. Which of the following would be the least likely cause for the gains in strength? neural adaptations related to muscle fiber recruitment. a greater proportion of Type IIa muscle fibers. muscle cell hyperplasia. increased myofibrillar proteins.arrow_forward
- During contraction, the bulk of calcium comes from: A. sarcomere B. sarcoplasm C. sarcoplasmic reticulum D. sarcolemma Coming off of the M line are _________ fibers and extending off of the Z line are __________ fibers. A. troponin; tropomyosin B. actin; myosin C. myosin; actin D. tropomyosin; actin E. myosin; tropomyosinarrow_forwardPredict how skeletal muscles may adapt to exercise.arrow_forwardWhich 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_forward
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