Health: The Respiratory System: Breathing and Lungs Worksheet

Question 1

Name two main jobs of the respiratory system.

Accepted Answer

The respiratory system brings oxygen into the body and removes carbon dioxide from the body.

Question 2

Put these parts in the order air travels when you breathe in: lungs, nose or mouth, trachea, bronchi.

Accepted Answer

Air travels in through the nose or mouth, then down the trachea, into the bronchi, and finally into the lungs.

Question 3

What is the diaphragm, and what does it do when you inhale?

Accepted Answer

The diaphragm is a dome-shaped muscle below the lungs. When you inhale, it moves downward to help the lungs expand and fill with air.

Question 4

Explain why oxygen is important for your body.

Accepted Answer

Oxygen is important because body cells use it to release energy from food. This energy helps the body move, grow, and stay alive.

Question 5

What waste gas leaves your body when you breathe out?

Accepted Answer

Carbon dioxide leaves the body when you breathe out. It is a waste gas made by cells as they use energy.

Question 6

The tiny air sacs in the lungs are called alveoli. What important job happens in the alveoli?

Accepted Answer

In the alveoli, oxygen moves from the air into the blood, and carbon dioxide moves from the blood into the air to be breathed out.

Question 7

Choose the healthier habit and explain why: playing outside away from smoke or sitting near cigarette smoke.

Accepted Answer

Playing outside away from smoke is healthier because smoke can irritate and damage the lungs, making it harder to breathe.

Question 8

During exercise, your breathing usually becomes faster. Explain why this happens.

Accepted Answer

Your breathing becomes faster during exercise because your muscles need more oxygen and make more carbon dioxide. Faster breathing brings in more oxygen and removes more carbon dioxide.

Question 9

Label the following parts as upper airway or lower airway: nose, trachea, lungs, mouth.

Accepted Answer

The nose and mouth are part of the upper airway. The trachea and lungs are part of the lower airway.

Question 10

What is the trachea, and why is it sometimes called the windpipe?

Accepted Answer

The trachea is a tube that carries air from the throat toward the lungs. It is sometimes called the windpipe because air, or wind, passes through it.

Question 11

Look at a model of lungs with two branches leading into them. What are the two large tubes that branch from the trachea into the lungs called?

Accepted Answer

The two large tubes that branch from the trachea into the lungs are called bronchi.

Question 12

Explain one way the nose helps protect the respiratory system.

Accepted Answer

The nose helps protect the respiratory system by filtering dust and germs from the air with hairs and mucus. It also warms and moistens the air before it reaches the lungs.

Question 13

A student says, 'The lungs pump blood around the body.' Is this correct? Explain your answer.

Accepted Answer

This is not correct. The heart pumps blood around the body, while the lungs help exchange oxygen and carbon dioxide.

Question 14

Write one healthy habit that can help keep your lungs strong and explain how it helps.

Accepted Answer

One healthy habit is getting regular exercise. Exercise helps the lungs and heart work better and can improve how the body uses oxygen.

Question 15

Describe what happens to your chest and lungs when you exhale.

Accepted Answer

When you exhale, the diaphragm relaxes and moves upward. The chest becomes smaller, and air is pushed out of the lungs.

Health: The Respiratory System: Breathing and Lungs

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