Info

Hormone

Source

Function

Gastrin

Gastric cells, in response to the presence of food

Causes gastric glands to increase their secretory activity

Intestinal gastrin

Cells of small intestine, in response to the presence of chyme

Causes gastric glands to increase their secretory activity

Somatostatin

Gastric cells

Inhibits secretion of acid by parietal cells

Intestinal somatostatin

Intestinal wall cells, in response to the presence of fats

Inhibits secretion of acid by parietal cells

Cholecystokinin

Intestinal wall cells, in response to the presence of proteins and fats in the small intestine

Causes gastric glands to decrease their secretory activity and inhibits gastric motility; stimulates pancreas to secrete fluid with a high digestive enzyme concentration; stimulates gallbladder to contract and release bile

Secretin

Cells in the duodenal wall, in response to acidic chyme entering the small intestine

Stimulates pancreas to secrete fluid with a high bicarbonate ion concentration

Duodenum

Duodenum

Ascending colon

Figure

The three parts of the small intestine are the duodenum, the jejunum, and the ileum.

Ascending colon

Cecum Mesentery Appendix

Ileum

Figure

The three parts of the small intestine are the duodenum, the jejunum, and the ileum.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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