Question

question 9 (mandatory) (0.75 points) in a nmj, what happens to the sarcolemma when acetylcholine is released into the synaptic cleft? allow influx of calcium ions and trigger action potential in muscle fiber allow influx of calcium ions and trigger release of another neurotransmitter into the sarcoplasm allow influx of sodium ions and trigger release of another neurotransmitter into the sarcoplasm allow influx of sodium ions and trigger action potential in muscle fiber

Explanation:

When acetyl - choline is released into the synaptic cleft of a neuromuscular junction (NMJ), it binds to receptors on the sarcolemma. This binding causes the sarcolemma to become more permeable to sodium ions. The influx of sodium ions depolarizes the membrane, which in turn triggers an action potential in the muscle fiber.

Answer:

allow influx of sodium ions and trigger action potential in muscle fiber