47, Which of the following staterments accurately describes the role of ATP in a

Question

47, Which of the following staterments accurately describes the role of ATP in a muscle a. ATP is directly responsible for the power stroke. b. ATP moves troponin and tropomyosin away from actin. c. ATP breaks the actin/myosin attachment and "cocks" the myosin head. d. ATP causes the myofilaments to shorten. contraction? 48. A muscle fiber relaxes when: a. the concentration of calcium ions in the cytosol returns to resting levels. b. the supply of ATP is exhausted c. calcium ions flood the cytosol. d. acetylcholine is released from the axon terminal and the sarcolemma depolarizes. 49 Which of the followring types of muscle fibers has low myosin ATPase activity and is classified as slow twitch? a. Type 1 fibers b. Type Ila fibers c. Type Ilx fibers d. Type llb fibers 50. Muscle tone is: a the result of voluntary shortening of the muscle. b. the result of a small amount of involuntary activation of motor units by the nervous system. c. abnormal- a person's muscles should be relaxed normally d. present only where there is damage to the nervous system. 51. Which of the following is not likely to result from endurance training alone? a. Increase in oxidative enzymes in the muscle fiber b. A transition from type llb to type lla muscle fibers. c. Hypertrophy of the muscle fibers. d. Increase in blood supply to the muscle fibers. 52. Which of the following best describes single-unit smooth muscle tissue? a. The fibers function individually b. It is found in organs that require precise control of contraction. c. It contains gap junctions that couple the fibers electrically d. The amount of tension produced varies with the number of muscle cells recruited. 53. What is the basic function of all muscle tissue? a. generate muscle tension b. produce voluntary contractions c. regulate body temperature d. stabilize joints 54. What do skeletal muscle tissue and cardiac muscle tissue share in common? a. Both skeletal and cardiac muscle tissues are voluntary. b. Both skeletal and cardiac muscle tissues are striated c. Both skeletal and cardiac muscle tissues possess intercalated discs. d. Both skeletal and cardiac muscle tissues perform peristalsis.

Explanation / Answer

Ans 49. A. type 1 are called slow twitch fibres

Ans 50. B. Muscle Tone is the result of a small amount of involuntary activation of motor units by the nervous system. Muscle tone can also be called as the state of passive partial contraction.

Ans 52. C. It contains gap junction that couple the fibres electrically.

Ans 53. A. Generate muscle tension.

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