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Unformatted text preview: a) they have a pacemaker potential that is much slower than the pacemaker potential of sinoatrial node cells. b) the opening of cell membrane Ca2+ channels causes the fast rise in membrane potential at the start of an action potential c) excitation-contraction coupling occurs when Ca2+ binds tropomyosin. d) an increase in the release of Ca2+ during excitation can increase the force of contraction. e) a and d. Correct answers: 1. c. 2. e....
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- Spring '08