HUMAN NUTRITION

Detailed explanation-1: -Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.

Detailed explanation-2: -What is peristalsis? Peristalsis is a type of involuntary muscle movement that occurs in your digestive system. It begins in your throat when you swallow, and continues to propel food and fluids throughout your gastrointestinal tract.

Detailed explanation-3: -Smooth muscles act by involuntary peristalsis, moving food through the digestive system.

Detailed explanation-4: -Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system. Smooth muscle cannot be controlled consciously and thus acts involuntarily.

Detailed explanation-5: -Swallowing (deglutition) or primary peristalsis begins with a voluntarily phase (oral phase) but once the bolus hits the tonsilar region and pharynx, it becomes autonomous or involuntary.