KEY-Bio416K_Exam_4_Spring_06 - Name KEY Bio 416K Physiology...

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Name________________________________ KEY- Bio 416K: Physiology and Functional Anatomy Lecture Exam 4 Spring ‘06 1. The sarcoplasmic reticulum has the following role in skeletal muscle contraction: a. Conduction of the action potential stimulated by the end plate potential b. Contains the dihydropyridine receptor proteins that translate the sarcolemma action potential c. Regulates Na + and K + levels within the sarcoplasm to reduce muscle fatigue d. Supplies glycogen and fatty acids for ATP production within the sarcoplasm e. Releases calcium in response to a sarcolemma action potential to initiate contraction 2. Which of the following would be affected if the number (availability) of acetylcholine receptors were reduced (for example, as occurs in the disease Myasthenia gravis)? a. Muscle cell resting membrane potential b. Somatic motor neuron action potential frequency c. Somatic motor neuron acetylcholine release d. Muscle end plate potential depolarization e. Somatic motor neuron acetylcholinesterase activity 3. In skeletal muscle myofibrils, at the conclusion of the power stroke, __________. a. Inorganic phosphate has been released from the myosin b. Actin has been moved toward the M line c. ADP is released from the myosin head d. The myosin head is tightly bound to actin e. All of these are correct 4. All of the following statements are correct EXCEPT: a. A power muscle, such as the gastrocnemius muscle of the leg, may have as many as a 1000 muscle fibers in one motor unit. b. All fibers in a single motor unit are of the same muscle fiber type c. With endurance training, the metabolic characteristics of some muscle fibers can be changed and enhanced. d. The entire skeletal muscle contracts in an all-or-none manner e. Each skeletal motor unit contracts in an all-or-none manner 5. Interneurons in the spinal cord prevent muscle antagonists from interfering with an intended movement by _____________________. a. A crossed extensor reflex b. A stretch reflex c. A tendon reflex d. Reciprocal inhibition e. Reverberating circuits 1
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6. Which of these muscle fiber types would fatigue the fastest? a. Fibers with an abundant supply of myoglobin b. Fibers that use direct phosphorylation as their primary ATP source c. Fibers with high levels of oxidative metabolism d. Fibers with large numbers of mitochondria e. Fibers with actin and myosin arranged in long, diagonal bundles 7. A Ca 2+ -ATPase channel antagonist would have what effect on skeletal muscle contraction? a.
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KEY-Bio416K_Exam_4_Spring_06 - Name KEY Bio 416K Physiology...

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