The acetylcholine receptor is a ligand-gated channel that produces
A. Depolarization by allowing K+ ions to leave the muscle fiber.
B. Depolarization by allowing Cl- ions to enter the muscle fiber.
C. Depolarization by allowing Na+ ions to enter the muscle fiber.
D. Hyperpolarization by allowing Na+ ions to exit the muscle fiber.
E. Repolarization by activating second messenger systems within the muscle fiber.
Answer: C
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