THORAX ABDOMEN AND PELVIS

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: -Peristalsis happens in our throats after we initially swallow our food. The food is moved down the esophagus by this involuntary muscle movement and delivered to the stomach. The muscles that preform peristalsis contract and relax in a way that is radially symmetrical.

Detailed explanation-3: -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.