THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -When you swallow, your throat (pharynx) begins the process by pushing food and fluids down into your esophagus (food pipe), which leads to your stomach. The esophagus has a primary peristaltic wave that’s triggered by swallowing, and a secondary one that kicks in when the first one isn’t enough.

Detailed explanation-2: -Gastrointestinal peristalsis involves the pharynx, esophagus, stomach, small intestine, large intestine, and rectum. The peristaltic movement of smooth muscle may also be found elsewhere throughout the body, including within the ureters, vas deferens, bile ducts, and glandular ducts.

Detailed explanation-3: -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.