Which of the following has its receptors on a gated ion channel for sodium ions (Na⁺)? A) Estrogen B) Acetylcholine C) Insulin D) Caffeine E) Protein kinase

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Acetylcholine binds to a gated ion channel for sodium ions (Na⁺), leading to the influx of sodium ions into the cell and depolarization of the membrane potential. This ultimately triggers muscle contraction or neuronal signaling. Estrogen, insulin, caffeine, and protein kinase do not bind to this type of ion channel.

Which of the Following Has Its Receptors on a Gated