Talk about the innervation of smooth muscle cells. (single unit)

Innervation allows the observation of 2 types of smooth muscle: - Single-unit (or unitary) smooth muscles: Are the most numerous. Their cells contract together in a rhythmic or peristaltic way because they are electrically coupled to each other by Gap junctions. When a muscle cell is stimulated, stimulation is spread to adjacent fibers so that the whole mass of muscle fibers contract together as a single unit. This unitary type is characterized by a relatively slow contraction. Eg : Baby delivery.