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chapter 11 True / False Questions 1. Extensibility refers to the ability of a muscle to stretch. True False 2. A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band. True False 3. The sarcoplasmic reticulum is the smooth endoplasmic reticulum of a muscle fiber. True False 4. Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers. True False 5. The sliding filament theory of muscle contraction has emerged from research only in the last 10 to 15 years. True False 6. A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis. True False 7. An isometric contraction does not change muscle length. True False 8. Some smooth muscle is autorhythmic. True False Essay Questions A. Skeletal muscle B. Cardiac muscle C. Smooth muscle 9. Which muscle tissue listed above is most dependent on extracellular Ca 2+ ? 10. Which muscle tissue listed above contracts in response to conscious nervous stimulation? 11. Which muscle tissue listed above does not exhibit striations? 12. Which muscle tissue listed above has the widest T tubules? 13. Which muscle tissue listed above has the greatest capacity for regeneration? Multiple Choice Questions 14. Which marks the boundaries of a sarcomere? A. 1 B. 2 C. 3 D. 4 E. 5 15. Which is predominately made up of myosin? A. 1 B. 2 C. 3 D. 4 E. 5 16. Which band contains overlapping thick and thin filaments? A. 1 B. 2 C. 3 D. 4 E. 5 17. Which of the following is not a purpose of the excess postexercise oxygen consumption in muscle? A. to neutralize carbon dioxide buildup B. to replenish the phosphagen system C. to oxidize lactic acid D. to serve elevated metabolic rate E. to restore resting levels of ATP and CP 18. Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source? A. skeletal muscle B. smooth muscle C. cardiac muscle D. skeletal and smooth muscle E. smooth and cardiac muscle 19. Which muscle(s) can contract without the need for nervous stimulation? A. skeletal muscle B. smooth muscle C. cardiac muscle D. smooth and cardiac muscle E. skeletal, smooth and cardiac muscle 20. 80% of the lactic acid produced by skeletal muscle is converted to pyruvic acid A. by the kidneys B. in the liver C. in the muscle tissue D. in the sarcoplasmic reticulum E. in the neuromuscular junction 21. During muscle contraction, a single myosin head consumes ATP at a rate of about A. 1 ATP per second. B. 3 ATP per second. C. 5 ATP per second. D. 7 ATP per second. E. 9 ATP per second. 22. The term for shortening of a muscle while maintaining constant tension is A. treppe. B. tetanus. C. isokinetic contraction. D. isometric contraction.... View Full Document

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