THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract.

Detailed explanation-2: -Peristaltic waves push the swallowed bolus down the esophagus. In the stomach, peristalsis churns swallowed food, mixing it with gastric juices. These mechanical and chemical actions further break down food into a substance called chyme.

Detailed explanation-3: -Peristalsis is progression of coordinated contraction of involuntary circular muscles, which is preceded by a simultaneous contraction of the longitudinal muscle and relaxation of the circular muscle in the lining of the gut.

Detailed explanation-4: -Muscularis propria (externa): smooth muscle layer. These layers of smooth muscle are used for peristalsis (rhythmic waves of contraction), to move food down through the gut.