For relaxation to occur,
A) ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close.
B) ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open.
C) ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close.
D) ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.
Correct Answer:
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