Exam4 416K-Fall 06 - Name Bio416K Physiology and Functional...

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Name________________________________ Bio416K Physiology and Functional Anatomy I Lecture Exam 4 Fall 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 in the sarcoplasm to reduce muscle fatigue d. Supplies glycogen and fatty acids for ATP production in the sarcoplasm e. Releases calcium in response to the sarcolemma action potential to initiate contraction 2. Manganese ions block the calcium channels in the cell membrane of contractile cardiac muscle cells. How would the presence of manganese in the extracellular fluid affect the contraction of the heart muscle? a. The plateau phase of contraction would be longer b. The action potential refractory period would be longer c. The heart would contract less forcefully d. The heart rate would increase e. The contraction phase would be prolonged 3. While watching Olympic weight lifters on the television, you notice that on several occasions an athlete would lift the weight to his chest and then suddenly drop it as if the muscles lifting the weight involuntarily relaxed. Which reflex would most likely explain what was happening to the weight lifter? 4. Which of the following would be affected if the number (availability) of muscle nicotinic acetylcholine receptors were reduced (for example, as occurs in the disease myasthenia gravis)?
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