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67. Curare blocks neuromuscular transmission by preventing the release of neurotransmitter from the motorneuron.TrueFalse
68. Organophosphate "nerve gases" induce paralysis by blocking neural stimulation of the neuromuscularjunctions, while botulinum toxin produces the same effect by inhibiting acetylcholinesterase.
69. The term "twitch" refers to the mechanical response of a muscle fiber during one cross-bridge cycle.
70. All isotonic contractions begin and end as isometric contractions.
71. During isometric contraction of a skeletal-muscle fiber, tension increases but the fiber length stays thesame.TrueFalse
72. The latent period of an isotonic twitch is shorter than the latent period of an isometric twitch.
73. Sustained contraction and tension in a skeletal muscle is called tetanus.
74. A skeletal muscle generates its greatest twitch tension when it is stretched to twice its resting length.
75. Fast fibers can be distinguished from slow fibers by the rate at which their myosin-ATPases split ATP.TrueFalse
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Chapter 1 / Exercise 10
Biochemistry
Garrett/Grisham
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76. Characteristics of oxidative fibers include numerous mitochondria, abundant myoglobin and large stores ofglycogen.
77. The difference in color between white muscle and red muscle is accounted for by the greater abundance ofglycogen in white muscle.
78. The fiber type intermediate between the two extremes of fast glycolytic and slow oxidative is slowglycolytic.
79. Muscles used for delicate, finely controlled movements have smaller motor units than more coarselycontrolled muscles.TrueFalse
80. In general, activating a slow-oxidative motor unit in a muscle will generate more tension than activating afast-glycolytic motor unit.
81. Endurance exercise, such as long-distance swimming, causes a preferential increase in glycolytic enzymesand increased mass of the exercising muscles.
82. The larger the diameter of a skeletal-muscle fiber, the greater the tension it can generate.
83. Recruitment of different types of motor units in a muscle is the primary means of varying the amount oftension generated in that muscle.TrueFalse
84. The shortening velocity of a skeletal muscle fiber increases with decreasing load because the rate at whichthe cross-bridge cycle can occur increases with decreasing load.
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Biochemistry
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Chapter 1 / Exercise 10
Biochemistry
Garrett/Grisham
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