Solved: During the contraction of a vertebrate skeletal muscle fiber, calcium ions a

Chapter 39, Problem 1

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During the contraction of a vertebrate skeletal muscle fiber, calcium ions a. break cross-bridges by acting as a cofactor in the hydrolysis of ATP. b. bind with troponin, changing its shape so that the myosinbinding sites on actin are exposed. c. transmit action potentials from the motor neuron to the muscle fiber. d. spread action potentials through the T tubules. e. re-establish the polarization of the plasma membrane following an action potential.

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