Question

Movement is not regulated by sphincter or valve during

• A. Movement of chyme
• B. Movement of food from oesophagus to stomach
• C. Release of bile into duodenum
• D. Movement of bolus into pharynx

Answer 1

The correct option is D

Movement of bolus into pharynx

Bolus is conveyed into pharynx and then into the oesophagus by swallowing or deglutition, which is not controlled by any valves or sphincters.

Movement of chyme from stomach to duodenum is controlled by pyloric sphincter.

Movement of partially digested food from oesophagus to stomach is controlled by cardiac sphincter.

Release of bile into duodenum is controlled by the sphincter of Oddi.