GENERAL HISTOLOGY

Detailed explanation-1: -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. Skeletal muscle fibers occur in muscles which are attached to the skeleton.

Detailed explanation-2: -Single-unit smooth muscle is found in the walls of hollow organs; multiunit smooth muscle is found in airways to the lungs and large arteries. Single-unit smooth muscle cells contract synchronously, they are coupled by gap junctions, and they exhibit spontaneous action potential.

Detailed explanation-3: -Termed unitary smooth muscle or visceral muscle, this type of smooth muscle is the most common observed in the human body, forming the walls of hollow organs. Single-unit smooth muscle produces slow, steady contractions that allow substances, such as food in the digestive tract, to move through the body.

Detailed explanation-4: -Visceral (Smooth) Muscle: Visceral muscle is found inside organs like the stomach, intestines, and blood vessels. Visceral muscle makes organs contract to move substances through. Visceral muscle is controlled by the unconscious part of the brain, making them involuntary muscles.