Final answer:
When acetylcholine binds to its receptor on the motor end plate, it results in the end plate potential, a graded potential, and a change in ion permeability, leading to the depolarization of the muscle cell's membrane.
Step-by-step explanation:
When acetylcholine (ACh) binds to its receptor, it results in C. The end plate potential, a graded potential, and a change in ion permeability. Acetylcholine is a neurotransmitter that plays a crucial role in the communication between nerve cells and muscles. Upon release from the presynaptic neuron, acetylcholine diffuses across the synaptic cleft and binds to acetylcholine receptors on the motor end plate.
This binding triggers the opening of ligand-gated sodium channels, leading to an influx of Na+ ions. The movement of ions causes a change in the voltage across the muscle cell's membrane, known as depolarization. This change in voltage constituting the end-plate potential may subsequently trigger an action potential if the depolarization reaches the threshold.