At a neuromuscular junction
A)actin and myosin filaments slide past one another.
B)troponin and tropomyosin exchange places.
C)neurotransmitters are released.
D)intercalated discs are synthesizeD.

Question

Quizplus · Accepted Answer

At a neuromuscular junction, neurotransmitters, such as acetylcholine, are released from the axon terminal of a motor neuron and bind to receptors on the muscle fiber, causing a depolarization and initiation of muscle contraction. Actin and myosin filaments sliding past one another is a part of muscle contraction, but it occurs in the muscle fiber itself, not the neuromuscular junction. Troponin and tropomyosin are regulatory proteins involved in muscle contraction, but they do not exchange places at the neuromuscular junction. Intercolated discs are specialized junctions found in cardiac muscle, not at neuromuscular junctions.

At a Neuromuscular Junction