Peristalsis Explained: The Body’s Natural Food Conveyor

Write a note on peristalsis.
Answer:

Definition:

Peristalsis is a coordinated reaction in which a wave of contraction preceded by a wave of relaxation passes down a hollow viscus.

Features:

It can occur in either direction from a stimulated point but it normally lies out rapidly in oral direction, while continuing for considerable distance towards the anus.
They are usually superimposed upon rhythmic segmental contractions.
It is always weak and usually disappears after travelling for few centimetres.
So the chyme requires several hours to travel from duodenum to the end of small intestine.
The peristaltic wave increases to a great extend immediately after a meal.

Function:

Regulation:

Stimulus for the peristaltic waves is distension.
As a result of distension, peristaltic waves pass along the intestine towards the rectum.
The local stretch releases serotonin, which activates sensory neurons that stimulates the myenteric plexus called “myenteric reflex”.

Reader Interactions