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