Question

multiple choice question
at neuromuscular junctions, acetylcholine binds to ______.
o receptors in the muscle fiber membrane
o troponin in the actin filament
o myosin cross - bridges
o sodium ions in the extracellular fluid
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Explanation:

At neuromuscular junctions, acetylcholine is a neurotransmitter that binds to specific receptors on the muscle fiber membrane to initiate muscle contraction. Troponin binds to calcium - not acetylcholine. Myosin cross - bridges are involved in the sliding filament mechanism and do not bind acetylcholine. Sodium ions are involved in the depolarization process but are not the binding target of acetylcholine.

Answer:

receptors in the muscle fiber membrane