The main action of acetylcholine (ACh) at cholinergic synapses in the peripheral nervous system results in which act?

1. Inhibition of optic muscles
2. Stimulation of cardiac muscle
3. Contraction of skeletal muscle
4. Relaxation of smooth muscle


Correct Answer: 3
Rationale 1: Inhibition of optic muscles is a central nervous system response.
Rationale 2: Acetylcholine produces the opposite effect.
Rationale 3: The main action of ACh is contraction of skeletal muscles.
Rationale 4: Acetylcholine produces the opposite effect.
Global Rationale: The main action of ACh is contraction of skeletal muscles. Inhibition of optic muscles is a central nervous system response. Acetylcholine inhibits cardiac muscles and causes contraction of smooth muscles.

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