GENERAL HISTOLOGY

Detailed explanation-1: -The parasympathetic nervous system (PNS) stimulates peristalsis via the myenteric plexus.

Detailed explanation-2: -In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus before being transformed into chyme in the stomach) along the tract.

Detailed explanation-3: -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-4: -Complete answer: The process of peristalsis in the esophagus is controlled by the medulla oblongata. The peristaltic movement includes circular and longitudinal smooth muscles.

Detailed explanation-5: -During peristalsis, the circular smooth muscle contracts behind (on the orad side) the bolus and relaxes in front (on the aborad side) of the bolus. At the same time, the longitudinal muscle relaxes orad to the bolus and contracts on the aborad side of the bolus.