GENERAL HISTOLOGY

Detailed explanation-1: -Smooth muscle is present in all of the organ systems below: Gastrointestinal tract. Cardiovascular-blood vessel and lymphatic vessels. Renal-urinary bladder.

Detailed explanation-2: -Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

Detailed explanation-3: -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.