It is a simple continuation of the peristaltic wave that begins in the pharynx and continues towards the esophagus during the pharyngeal phase of swallowing.

GASTROINTESTINAL PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	primary peristalsis
B	Secondary peristaltism
C	voluntary swallowing phase
D	Pharyngeal stage

Explanation:

Detailed explanation-1: -Pharyngeal peristalsis follows the tail end of bolus and is the slower part of the bolus transport mechanism across the pharynx. The speed of peristalsis is approximately 15 cm/sec in the pharynx and it takes 1 second for the contraction wave to travel from the top of pharynx to the UES.

Detailed explanation-2: -Esophageal Phase [12] This phase ends once the bolus passes through the lower esophageal sphincter (LES) and into the stomach. At rest, the LES is tonically contracted to prevent reflux from the stomach, and it undergoes relaxation during the swallowing phase.

Detailed explanation-3: -The first irreversible step in swallowing, the pharyngeal stage, occurs next and is categorized by a rapid phase of muscle contraction to propel the bolus through the upper esophageal sphincter and into the esophagus. This stage starts when the consumed bolus makes its way to the palatoglossal arch.

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