GI Physiology

1. Hormones

1.1. Gastrin

1.1.1. Produced by

1.1.1.1. G cells

1.1.1.2. Antrum of stomach

1.1.1.2.1. Duodenum

1.1.1.2.2. Pancreas

1.1.2. Stimulated by

1.1.2.1. Entry of food into stomach

1.1.2.1.1. Peptides in stomach lumen stimulate gastrin release

1.1.2.2. Stretching of stomach

1.1.3. Stimulates

1.1.3.1. Parietal cells

1.1.3.1.1. acid secretion

1.1.3.2. Acid Secretion

1.1.3.2.1. Parietal Cells

1.1.3.2.2. ECL Cells

1.1.3.2.3. Trophic action

1.1.3.3. Gastric motility

1.1.4. Inhibited by

1.1.4.1. Negative feedback

1.1.4.1.1. Gastric Acid pH < 3

1.2. Secretin