AP Biology Multiple Choice Practice Test

Question 1 of 3

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All of the following occur for the contraction of a motor muscle except:

	The actin cross-bridges attach to the myosin filaments.
	A neurotransmitter diffuses across the neuromusclar junction.
	The sarcoplasmic reticulum releases Ca2+
	ATP is available.
	An action potential travels along the T-tubules.