What action does acetylcholine have in a muscle cell?
a) opens voltage gated na+ channels
b) opens receptor gated na+ channels
c) opens mechanically gated na+ channels

The answer is B: opens receptor galted NA+ channels

Explanation:

The action of acetylcholine in a muscle cell is to activate the sodium (Na +) channels through receptors. There are two types of acetylcholine receptors:

- Nicotinic or ionotropic receptor = The action on this receptor is excitatory.

- Muscarinic or metabrotopic receptor = The action on this receptor is inhibitory.

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