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Physiology Practice Test: Muscle Physiology
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Physiology Practice Test: Muscle Physiology
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25 Questions

1. Which of the following adaptations does NOT generally occur with aerobic exercise?
2. What enzyme catalyzes the reaction that creates creatine phosphate?
3. There are no slow glycolytic fibers.
4. Which of the following statements about excitation-contraction coupling in skeletal muscle is FALSE?
5. In smooth muscle, calcium triggers contraction by binding to what protein?
6. What structure composed of connective tissue transmits force from contracting skeletal muscle to bone?
7. Which of the following statements is TRUE regarding activation of alpha and gamma motor neurons?
8. Which of the following is NOT an adaptation of skeletal muscle that would be observed in response to aerobic training?
9. What is the protein component of the thin filament that binds to calcium thereby initiating skeletal muscle contraction?
10. Which of the following statements about summation and tetanus is FALSE?
11. Since the creatine phosphorylation reaction is substrate driven, an increase in the concentration of creatine within a skeletal muscle fiber will directly have what effect?
12. As skeletal muscle shortens with contraction, the length of the I band remains constant as the length of the A band decreases.
13. The contraction phase of a twitch lasts longer than the relaxation phase.
14. Skeletal muscle fibers operate at near-optimal sarcomere length in situ.
15. As skeletal muscle is further stretched beyond the length where optimum force is developed, ________.
16. Skeletal muscle and cardiac muscle are multinucleated cells, whereas smooth muscle cells each have one nucleus.
17. The shortening of a skeletal muscle fiber during contraction involves which of the following?
18. Binding of ATP to myosin increases myosinʹs affinity for actin.
19. The proximity of the sarcoplasmic reticulum to each sarcomere permits the nearly simultaneous delivery of calcium to all sarcomeres of the muscle fiber.
20. During skeletal muscle contraction, multiple crossbridge cycles are occurring between the same thick and thin filament. Which of the following best describes this process?
21. The binding of calcium to troponin will directly cause which of the following?
22. A skeletal muscle with slower ATPase activity can complete more crossbridge cycles per second.
23. The interaction between actin and myosin in smooth muscle requires ________.
24. What portion of a sarcomere shows up as light striations when viewed under a microscope?
25. Hemoglobin in skeletal muscle acts as an oxygen buffer.

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