The breakdown of complex organic molecules into smaller components by enzymes.
Digestion.
The taking in of nutrients.
Ingestion.
The transport of digested nutrients to the cells of the body.
Absorption.
The removal of food waste from the body.
Egestion.
An enzyme that breaks down complex carbohydrates.
Amylase
Rhythmic, wavelike contractions of a muscle that move food along the gastrointestinal tract.
Peristalsis.
A constrictor muscle that regulates the opening and closing of a tubelike structure.
Sphincter.
A protective lubricating substance composed mostly of protein.
Mucus.
A protein-digesting enzyme produced in the stomach.
Pepsin
A lesion on the surface of an organ.
Ulcer.