CCLS 14.7 What is digestion?

The process by which large pieces of food are cut and crushed into smaller pieces.

• mechanical digestion

• enamel

• dentin

• chemical digestion

• enzyme

The hard, outer coating of the tooth.

• mechanical digestion

• enamel

• dentin

• chemical digestion

• enzyme

A spongy substance below the enamel of the tooth.

• mechanical digestion

• enamel

• dentin

• chemical digestion

• enzyme

The process by which large food molecules are broken down into smaller food molecules.

• mechanical digestion

• enamel

• dentin

• chemical digestion

• enzyme

Protein that controls chemical reactions in the body.

• mechanical digestion

• enamel

• dentin

• chemical digestion

• enzyme

There are different enzymes that help digest food. Each enzyme can break down only one specific kind of food molecule. For example, one enzyme in saliva helps digest starch. It changes starch into sugar.

• True

• False

Enzymes act on the INSIDE of food particles.

• True

• False

The chemical digestion of food takes a number of steps. With each step, food is broken down into smaller and smaller particles and then molecules.

• True

• False

The body can use only the smallest, simplest molecules.

• True

• False

The crushing of food by the teeth is a ______________ change.

• mechanical

• physical

• chemical