Question

Sometimes chyme is pushed back into stomach from the duodenum. What is this called?

• A. Grinding
• B. Propulsion
• C. Mixing
• D. Retropulsion

Answer 1

The correct option is D Retropulsion

The rhythmic contraction and relaxation of the wall of the alimentary canal is called peristaltic movement. It is of following types:
$\bullet$ Propulsion is the peristaltic movement of food from one part to another part.
$\bullet$ Grinding is the vigorous peristalsis and mixing action that occurs close to pylorus.
$\bullet$ Retropulsion is the movement of small amounts of chyme into duodenum and forcing most of it back into the stomach.