Rather than tightly coupled synapses between neurons and muscle cells, single-unit smooth muscle contains
A. varicosities of a subset of muscle fibers so that individual cells can be separately stimulated.
B. plaques and caveolae that contain multiple hormone receptors for discrete endocrine control.
C. gap junctions that connect neurons to smooth muscle cells.
D. diffuse junctions where neuron varicosities are responsible for neurotransmitter release.
Answer: D
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