The Respiratory System

Question 1

What gas do we need to live?

Answer 1

Oxygen

Oxygen is essential for cellular respiration.

Question 2

What happens to oxygen when we breathe in?

Answer 2

It moves into the blood vessels in the lungs

Oxygen is then transported by blood to the heart and other parts of the body.

Question 3

What does the body produce as it uses up oxygen?

Answer 3

Carbon dioxide

Carbon dioxide is a waste product of cellular respiration.

Question 4

How does blood transport carbon dioxide?

Answer 4

It carries carbon dioxide back to the lungs

This process is part of the respiratory cycle.

Question 5

How do we get rid of carbon dioxide?

Answer 5

By breathing it out

Carbon dioxide is expelled through the nose or mouth.

Question 6

Fill in the blank: Air enters the body through the _______.

Answer 6

nose or mouth

Air can also enter through the trachea.

Question 7

Fill in the blank: Air leaves the body through the _______.

Answer 7

nose or mouth

The exit pathway for carbon dioxide is the same as the entry pathway.

Question 8

What is the path of air after entering the body?

Answer 8

It goes down the windpipe

The windpipe is also known as the trachea.

Question 9

True or False: Breathing out makes your chest get bigger.

Answer 9

False

When you breathe out, your chest cavity contracts, making it smaller.

Question 10

Explain how we are able to blow up a balloon.

Answer 10

By forcing air from our lungs into the balloon

The increase in air pressure inside the balloon causes it to expand.