Gastrointestinal System | Medical Library Online

Gastrointestinal System

Phases of gastric secretion
Phases of gastric secretion

There are three phases namely: Cephalic Gastric Intestinal.Cephalic phaseConditioned reflexes like sight, smell, thought of food causes secretion of.

Movements of stomach
Movements of stomach

Receptive relaxationThe stomach shows receptive relaxation, accommodating large volume of food. The receptors for this are present in the wall of pharynx.

Deglutition
Deglutition

It refers to the act of swallowing. It consists of oral, pharyngeal and oesophageal stages. The first stage is voluntary, second and third stages are involuntary.

Liver Functions
Liver Functions

Functional unit of liver consists of lobules. Each hepatic lobule has cells radiating centrifugally from a central vein. The periphery of the lobule shows.

Other GI hormones
Other GI hormones

MotilinIt is a polypeptide and secreted from the duodenal mucosa. It causes contraction of intestinal smooth muscle and regulates interdigestive motility.

Secretin  and GIP (gastric inhibitory peptide)
Secretin and GIP (gastric inhibitory peptide)

It was the first chemical messenger discovered by Bayliss and Starling in the year 1902. The historical significance is that the term hormone for chemical.

Gastrin
Gastrin

This is secreted from the G cells of pyloric antral mucosa. This region has a neural crest origin and is capable of taking amine precursors and decarboxylate.

Gastric secretion
Gastric secretion

Gastric juice is secreted by the gastric glands, present in the gastric mucosa of fundus and body of the stomach. The glands are long coiled tubular structures,.

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