Postganglionic autonomic fibers
A) end in a single terminal swelling, like a synaptic knob, that releases the neurotransmitter.
B) have numerous varicosities in their terminal branches that simultaneously release neurotransmitter over a large area of the innervated organ rather than on single cells.
C) innervate skeletal, smooth, and cardiac muscle.
D) both (a) and (c) above.
E) both (b) and (c) above.

Question

Quizplus · Accepted Answer

Postganglionic autonomic fibers have numerous varicosities in their terminal branches that simultaneously release neurotransmitter over a large area of the innervated organ rather than on single cells. They do not innervate skeletal muscle, only smooth and cardiac muscle, so option C is incorrect. Option A is also partly correct, but not the best answer as it only describes the terminal swelling of some synapses, not necessarily postganglionic autonomic fibers.

Postganglionic Autonomic Fibers