E & F
enzyme [in zime]
A protein that triggers chemical reactions in the body
esophagus [e sof u gus]
The tube that passes food and drink from the mouth to the stomach
fat
A soft substance made of a mixture of lipids that is found in organic tissue
feces [fee sees]
Body wastes excreted from the digestive tract
fiber [fi bur]
The part of food that can't be digested by humans and passes through the intestine basically unchanged. Fiber helps move waste through the digestive system more quickly.
filtrate [fil trat]
The material that has passed through a filter.
free radical [free • rad i kal]
An atom or a group of atoms that have unpaired or "free" electrons. Free radicals are very reactive. They cause a reaction called oxidation. One example of oxidation is rust. Oxidation is harmful to the human body.