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Anatomy General d7ec24fe

All of the following are true about excitation contraction coupling except:

A
Acetylcholine is released at the nerve terminal
B
Calcium is pumped back into the sarcoplasmic reticulum during relaxation
C
Calcium is released from sarcoplasmic reticulum during contraction
D
Calcium binds to tropomyosin to initiate muscle contraction
High-Yield Explanation
Ans. d. Calcium binds to tropomyosin to initiate muscle contraction Calcium binds to Troponin C, not to the tropomyosin, to initiate muscle contraction. `The calcium released into the cytosol binds to Troponin C by the actin filaments, to allow cross-bridge cycling, producing force and, in some situations, motion.'

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