B265F Test 4 answers

B265F Test 4 answers - Biology 265 General Physiology Test 4 Spring 2008 Form 0 1 Which of the following muscles have motor units with the highest

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Biology 265 General Physiology Test 4 Spring 2008 Form 0 1. Which of the following muscles have motor units with the highest innervation ratio ? a. leg muscles b. arm muscles c . muscles that move the fingers d. muscles of the trunk 2. The stimulation of gamma motor neurons produces a. isotonic contraction of the intrafusal spindle fibers b. ismetric contraction of the intrafusal spindle fibers c. contraction of the main muscle d. contraction of the nuclear bag fiber 3. When a skeletal muscle shortens during contraction, which of the following is false ? a. the A bands shorten b. the H bands shorten c. the I bands shorten d. the sarcomere shortens 4. Electrical excitation of a muscle fiber most directly causes a. movement of tropomyosin b. attachment of the cross bridges to actin c. release of calcium from the sarcoplasmic reticulum d. splitting of ATP 5. The energy for muscle contraction is most directly obtained from a. phosphcreatine b . ATP c. anaerobic respiration d. aerobic respiration 6. Which of the following statements about cross bridges is false ? a. they are composed of myosin b. they bind to ATP after they detach from actin c. they contain ATPase d. they split ATP before they make contact with actin 7. When a muscle is stimulated to contract calcium binds to a. myosin b. tropomyosin c. actin
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d . troponin 8. Which of the following statements about muscle fatigue is false ? a . it may result when ATP is no longer available b. it may be caused by a loss of muscle cell calcium c. it may be caused by accumulation of extracellular K+ d. it may be the result of lactic acid build up 9. Which of the following muscle types is striated and contains gap junctions ? a. smooth muscle
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This document was uploaded on 11/04/2011 for the course BIL 265 at University of Miami.

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B265F Test 4 answers - Biology 265 General Physiology Test 4 Spring 2008 Form 0 1 Which of the following muscles have motor units with the highest

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