All of the following occur for the contraction of a motor muscle EXCEPT:
A. The sarcoplasmic reticulum releases Ca2+
B. The actin cross-bridges attach to the myosin filaments.
C. An action potential travels along the T-tubules.
D. ATP is available.
E. A neurotransmitter diffuses across the neuromuscular junction.
Answer: B. The actin cross-bridges attach to the myosin filaments.