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Amino acid

Building block of protein.

1

Carbohydrate

Nutrient that usually is the body's main source of energy.

2

Chemical digestion

Occurs when enzymes and other chemicals break down large food molecules into smaller ones.

3

Chyme

Liquid product of digestion.

4

Enzyme

A type of protein that regulates nearly all chemical reactions in the body without being changed or used up itself.

5

Fat

Nutrient that stores energy, cushions organs, and helps the body absorb vitamins.

6

Food group

Group of foods (such as bread, cereal, rice, and pasta) containing the same type of nutrients.

7

Mechanical digestion

Breakdown of foods through chewing, mixing, and churning.

8

Mineral

Inorganic nutrient that regulates many chemical reactions in the body.

9

Nutrients

Substances in foods (proteins, carbohydrates, fats, vitamins, minerals, and water) that provide energy and materials for cell development, growth, and development.

10

Peristalsis

Waves of muscular contractions that move food through the digestive tract.

11

Protein

Large module that contains carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur and is made up of amniotic acids; used by the body for growth and for replacement and repair of body cells.

12

Villi

Fingerlike projections covering the wall of the small intestine that increase the surface area for food absorption.

13

Vitamin

Water-soluble or fat-soluble organic nutrient needed in small quantities for growth, for preventing some diseases, and for regulating body functions.