Multiple Choice
In order for a muscle contraction to occur, cross-bridges must form between which one of the following structures within a muscle cell?
A) the plasma membrane and the sarcoplasmic reticulum
B) troponin and tropomyosin
C) calcium and tropomyosin
D) acetylcholine and muscle cell receptors
E) actin and myosin
Correct Answer:

Verified
Correct Answer:
Verified
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