Which of the following is not involved in the relaxation of muscle?
a. when acetylcholine is destroyed by acetylcholinesterase.
b. when there is no longer a local action potential.
c. when the T tubules actively take up the Ca2+ that had been released.
d. when the actin and myosin molecules are no longer bound together.
e. when the troponin-tropomyosin complex slips back into its blocking position.
C
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