Cells forming a thin tissue lining of body surfaces.
Saclike membrane filled with chemicals and enzymes that can break down almost any substance within a cell.
Flap of tissue that prevents food from entering the trachea (air passageway).
Tube through which food passes from the pharynx to the stomach.
Muscular contractions that pass food through the alimentary canal or digestive tract.
Thick ring of muscle which closes the esophagus after food has passed into the stomach; prevents the contents of the stomach from moving back.
Protein-digesting enzyme produced by gastric glands in the stomach.
A mixture of stomach fluids and food in the stomach area.
First part of the small intestine; located between the stomach and jejunum; mixes secretion from liver, pancreas and gallbladder with chyme in the stomach.
Gland located between the stomach that produces digestive enzymes and certain hormones that regulate blood sugar.
Large gland located above the stomach that produces bile to aid digestion.
A mixture of substances containing bile salts, which emulsify fats and aid in their digestion and absorption.
organ located just beneath the liver which stores bile and expels bile into the small intestine when it is needed to help digest fats.
Millions of projections on the folded surfaces of the small intestine that increase the surface area for absorption of food molecules.
Tiny, fingerlike projections on the surfaces of the cells of the villi.
Network of vessels that collects fluid that leaks from the capillaries and returns to the circulatory system.