Human Digestive System

A process in which partially digested food returns to the mouth in small lumps and the animal chews it. This type of process is called rumination

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The powerful muscles in oesophagus gently push food down to the stomach in a wave-like action called peristalsis.

Undigested and unabsorbed food enters into the large intestine. It is about 1.5 metres in length.

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The pancreas is a mixed gland.  

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Secretin stimulates the release of a watery bicarbonate solution from the pancreatic and bile duct epithelium to buffer the incoming protons of the acidic chyme.

Correct Answer: Promoting insulin sensitivity

Secretin is produced in the duodenum. It stimulates the pancreas to produce alkaline secretions and slows the emptying of the stomach.

GIP is produced by the K-cells. They are found in the mucosa of the duodenum and the jejunum of the gastrointestinal tract

Target organs of secretin are stomach, pancreas and liver. Secretin inhibits the production of gastric juice in stomach and stimulates the production of hydrogencarbonate ions in the pancreatic juice in pancreas and bile juice in liver.

Caffeine increases stomach acid secretion by directly stimulating parietal cells, bypassing the gastrin control mechanism.