Question

How does a ligand-gated ion channel work with the neurotransmitter, acetylcholine, to allow sodium ions into a muscle cell?

A) Acetylcholine binds to the receptor site on the ligand-gated ion channel, causing it to open and allow sodium ions to enter the muscle cell.
B) Acetylcholine binds to the receptor site on the ligand-gated ion channel, causing it to close and prevent sodium ions from entering the muscle cell.
C) Acetylcholine does not interact with the ligand-gated ion channel, and sodium ions enter the muscle cell through a different mechanism.
D) Acetylcholine binds to the receptor site on the ligand-gated ion channel, causing it to change shape and allow sodium ions to enter the muscle cell.

Answer 1

Acetylcholine binds to a ligand-gated ion channel, causing it to change shape and allow sodium ions to enter the muscle cell.

Step-by-step explanation:

A ligand-gated ion channel works with the neurotransmitter acetylcholine to allow sodium ions into a muscle cell through the following process:

1. Acetylcholine binds to the receptor site on the ligand-gated ion channel.
2. This binding causes the ion channel to change shape and open its pore.
3. The open pore allows sodium ions to enter the muscle cell.

Therefore, the correct answer is D) Acetylcholine binds to the receptor site on the ligand-gated ion channel, causing it to change shape and allow sodium ions to enter the muscle cell.