A muscular sac {stomach}| on trunk left side receives food from esophagus. Stomachs have region {cardiac region} near heart, large sac {fundus, stomach}, and pylorus. Stomachs have a smooth-muscle-ring sphincter at top opening, which closes after bolus enters. Stomach and digestive tract have inner mucosa, middle circular and longitudinal muscle layers, and outer connective-tissue layer. Stomachs hold 2.5 liters. Stomachs can absorb alcohol, aspirin, and poisons. Helicobacter pylori bacteria cause stomach ulcers.
Birds and primitive mammals have stomachs {craw}| that store and break down food.
Peristalsis churns food to soup {chyme}. Chyme passes through sphincter to small intestine.
Stomach glands {gastric gland} secrete hydrochloric acid and proteolytic enzymes. Gastrin hormone controls stomach secretions.
Stomach and digestive tract have inner mucous membrane {mucosa}|.
Stomachs have a region {pylorus}| near small intestine.
Brain controls ability to eject stomach contents {vomiting reflex}|.
4-Zoology-Organ-Digestion-Parts
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225