Which of the following is FALSE regarding single-unit smooth muscle cells?
A)They have an individual neuron innervating each individual smooth-muscle cell.
B)They have many gap junctions between cells.
C)They may have pacemaker activity.
D)They may respond to stretch by contracting.
E)They exhibit tone.

Question

Which of the following is FALSE regarding single-unit smooth muscle cells?
A)They have an individual neuron innervating each individual smooth-muscle cell.
B)They have many gap junctions between cells.
C)They may have pacemaker activity.
D)They may respond to stretch by contracting.
E)They exhibit tone.

Quizplus · Accepted Answer

Single-unit smooth muscle cells are connected by gap junctions and act as a syncytium, so they do not have individual neuron innervating each individual smooth-muscle cell. Rather, they are innervated by autonomic neurons that release neurotransmitters that diffuse through the tissue and stimulate multiple cells simultaneously.

Which of the Following Is FALSE Regarding Single-Unit Smooth Muscle