MICROANATOMY

Detailed explanation-1: -Smooth muscles are of two types. They are: Single-unit (visceral) smooth muscle: All the cells function collectively and simultaneously as a single unit (unitary). Multiunit smooth muscle: It is a type of muscle in which all the cells cannot function collectively and work independently.

Detailed explanation-2: -Single-unit smooth muscle consists of multiple cells connected through connexins that can become stimulated in a synchronous pattern from only one synaptic input. Connexins allow for cell-to-cell communication between groups of single-unit smooth muscle cells.

Detailed explanation-3: -Cells of multiunit smooth muscles contract and relax on their own individually, and they do not act as a single unit.

Detailed explanation-4: -A twitch is a single contraction and relaxation cycle produced by an action potential within the muscle fiber itself.