What Ion Enters the Muscle Cell Upon Activation of the Acetylcholine

Question

What ion enters the muscle cell upon activation of the acetylcholine receptors?
A) sodium
B) calcium
C) potassium
D) chloride

Accepted Answer

Activation of acetylcholine receptors in the muscle cell leads to the influx of sodium ions, which triggers depolarization of the cell and ultimately leads to muscle contraction.