NEET BIOLOGY

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: -The pyloric sphincter is a circular muscle that acts as a valve that regulates the flow of chyme from the stomach into the duodenum of the small intestine. This sphincter muscle also prevents the duodenal contents from flowing back into the stomach.

Detailed explanation-3: -The muscle movements of peristalsis are often described as wave-like because they contract and relax in a continuous pattern to move food forward. They involve both the circular muscles that ring the tubes of your digestive tract and also longitudinal muscles that span the walls of the tubes.

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: -Peristalsis is the main function of the muscle layer in the gastrointestinal tract. Segmenting contractions of the inner circular muscles result in ring-like constrictions that aid in mining the ingesta for further digestion and absorption.