Quiz 37 - It would exaggerate muscle reflexes such as the...

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Question 1 Multiple Choice 0.5 points If one type of skeletal muscle fiber has twice the number of Ca++ pumps (Ca++ ATPases) in its sarcoplasmic reticulum compared to another type of fiber, but otherwise the fibers were the same, how would the twitch contractions of the two fiber types differ? Twitches in the fibers with more Ca++ pumps would likely be graded, rather than all-or-none, in amplitude. Twitches in the fibers with more Ca++ pumps would be more resistant to fatigue during prolonged activity. The fibers with more Ca++ pumps would exhibit a twitch with shorter duration. The fibers with more Ca++ pumps would twitch more strongly. Question 2 Multiple Choice 0.5 points Dantrolene is a drug that lowers the concentration of free Ca++ ions within muscle fibers, by blocking release of Ca++ from the sarcoplasmic reticulum. What effect would you expect dantrolene to have on muscle function?
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Unformatted text preview: It would exaggerate muscle reflexes such as the stretch (knee-jerk) reflex. It would increase the likelihood of developing muscle cramps. It would prolong the duration of the muscle twitch. It would reduce the strength of muscle contraction. Question 3 Multiple Choice 0.5 points Tetanus refers to The continuous, low level of muscle contraction responsible for maintaining posture. A smooth, sustained contraction caused by repetitive motor nerve activity. Progressively stronger contractions as more motor units are activated. A state of muscle fatigue caused by depletion of ATP. The all-or-none contraction of a single muscle fiber. Question 4 True/False 0.5 points Is the following statement is True or False? Among the different types of skeletal muscle fibers, those with the fewest mitochondria tend to contract most rapidly. True False...
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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