Course Content
Biology Form 1
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Digestion in the Duodenum

The chyme is let out into the duodenum through the pyloric sphincter.

 The sphincter muscle allows small quantities of chyme to pass through at a time.

The duodenum is the first part of the small intestine where most of the digestion takes place.

The duodenum receives secretions from the liver and the pancreas.

  • The liver has specific cells which secrete bile into the gall bladder to be stored. The gall bladder releases the bile into the duodenum through bile duct.
  • The pancreas lies just below the stomach. It is thin flat and cream-coloured gland.

Functions of the pancreas:

  • Secretion of digestive juices.
  • Secretion of hormones (that regulate sugar concentration)

The arrival of food in the duodenum stimulates secretion of hormone secretin from the pancreas and cholecystokinin from the duodenal wall.

Secretin stimulates the secretion of pancreatic juice into the duodenum.

Cholecystokinin stimulates the secretion of bile from the gall bladder.

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