9. Muscle Tissue
Steps of Muscle Contraction
Multiple Choice
Multiple ChoiceWhen an action potential arrives at the neuromuscular junction, the most immediate result is __________.
A
the release of acetylcholine from the motor neuron
B
the depolarization of the sarcolemma
C
a rise in intracellular Ca2+ levels in the muscle fiber
D
the formation of actin-myosin cross bridges
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