Muscle Mechanisms of Contraction and Neural Control

Muscle Mechanisms of Contraction and Neural Control -...

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Guided Reading – Muscle: Mechanisms of Contraction and Neural Control I 1. The pyramidal tracts include the __________ and _____________ tracts. A. rubrospinal, lateral corticospinal B. reticulospinal, ventral corticospinal C. ventral corticospinal, lateral corticospinal D. rubrospinal, reticulospinal 2. Hemiplegia is paralysis of an upper limb of one side and the lower limb of the other side. True False 3. The cerebellar influence on motor activity is excitatory. True False 4. What type of sensory neuron is associated with a muscle spindle apparatus? A. primary, annulospiral sensory endings B. pyramidal sensory endings C. secondary, flower-spray sensory endings D. Both primary, annulospiral sensory endings and secondary, flower-spray sensory endings are correct. 5. The arrector pili muscles and ciliary muscles are multi-unit smooth muscles. True False 6. Slow twitch fibers have a ______ oxidative capacity and ________ glycogen content. A. high, high B. high, low C. low, low D. low, high 7. A reserve of high energy phosphate is stored in muscle as A. phosphocreatine. B. adenosine triphosphate. C. glucose 6-phosphate. D. creatine kinase. 8. The cerebellum directly influences motor activity. True False 9. Muscle hypertrophy is due to A. increased number of myofibrils in the muscle fiber. B. increased number of muscle fibers. C. increased size of the myofibrils. D. Both increased number of myofibrils in the muscle fiber and increased size of the myofibrils are correct. 10. Which of the following is NOT true of slow oxidative/Type I red muscle fibers? A. small diameter B. high resistance to fatigue C. high amount of myosin ATPase present D. slow twitch rate
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11. Which of the following is NOT a contributing factor to skeletal muscle fatigue? A. increased intracellular K + B. depletion of intracellular K + C. accumulation of extracellular K + D. accumulation of cytoplasmic PO 4 3- 12. Myosin will not bind to actin unless ADP is bound to the myosin head. True False 13. Muscle spasms can be avoided by stretching slowly, which stimulates mainly the primary, annulospiral sensory endings. True False 14. What muscle structural and functional unit runs from Z disc to Z disc? A. A band B. I band C. sarcomere D. myofibril 15. Neurotransmitters are released at neuromuscular junctions to smooth muscle cells. True False 16. Which molecule blocks the myosin head from binding to actin in a relaxed muscle? A. tropomyosin B. troponin C. calcium D. titin 17. Which of the following statements regarding cardiac muscle is true? A. Dense bodies anchor thin filaments. B. Fibers lack I and A bands. C. Intercalated discs contain gap junctions. D. Fibers lack branches.
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This note was uploaded on 03/20/2012 for the course MCB 32 taught by Professor Smiley during the Fall '11 term at Cal Poly.

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Muscle Mechanisms of Contraction and Neural Control -...

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