Lesson 4

Question 1

What is the white outer layer of your tooth called?

Answer 1

Enamel

Question 2

What is the layer right below the enamel called?

Answer 2

Dentin

Question 3

What is the hardest substance in your body?

Answer 3

Enamel

Question 4

Name a few things saliva does for you.

Answer 4

Begins chemical digestion
Protects teeth
Defends against infection
Makes your food taste better

Question 5

What is the name of the pipe that food goes down after you swallow it?

Answer 5

Esophagus

Question 6

How do your stomach and esophagus keep from getting burned by your own stomach acid?

Answer 6

Mucus is produced in the stomach and the gastroesophageal sphincter keeps it in the stomach.

Question 7

What is the food called when it enters the small intestine?

Answer 7

Chyme

Question 8

What happens in the small intestine?

Answer 8

After digestion is completed, nutrients are sent to the bloodstream.

Question 9

Which organ is like a huge chemical factory?

Answer 9

Liver

Question 10

What do the kidneys do?

Answer 10

They remove excess salt, water, and other substances from the blood and put them in the urine.