MICROANATOMY

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.

Detailed explanation-2: -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-3: -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.

Detailed explanation-4: -Smooth muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations (bands or stripes). It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium.

Detailed explanation-5: -Gastrointestinal tract. Cardiovascular: Blood vessel and lymphatic vessels. Renal: Urinary bladder. Genital: Male and female reproductive tracts. Respiratory tract. Integument: erector pili of the skin. Sensory: Ciliary muscle and iris of the eye.