Question

arrange the following in the order in which they occur at the postsynaptic side of a neuromuscular junction: 1. an action potential is propagated over the muscle cell membrane. 2. depolarization of the postsynaptic membrane 3. sodium ions move into muscle cell. multiple choice 1,2,3 2,1,3 2,3,1 3,2,1

Explanation:

At the postsynaptic side of a neuromuscular junction, first, the postsynaptic membrane depolarizes due to the binding of neurotransmitters. This depolarization opens sodium - ion channels, allowing sodium ions to move into the muscle cell. The influx of sodium ions then propagates an action potential over the muscle cell membrane.

Answer:

C. 2, 3, 1