Respiration

Respiration

How do we get air

Our body is made of cells. These cells need....

• Nutrients, that we get from food

• Oxygen, that we get from the air around us

They produce....

• Residues, that have to be put out of the body.

• Carbon Dioxide, that get out of the body through breathing.

How do we breath?

There are some phases....

Phase 1

Air enters the body through the mouth and nose.

Phase 2

Air goes down a tube called trachea.

Phase 3

The trachea is divided in two to go in each lung. These two divisions are called bronchi.

Phase 4

The bronchi get smaller and smaller. The smallest ones are called bronchioles.

Phase 5

At the end of the bronchioles, there are some bags called alveoli. These alveoli are surrounded by blood vessels.

Phase 6

In the alveoli is where the gas exchange happens: the blood gets oxygen (O₂) from the alveoli and put carbon dioxide (CO₂) into the alveoli.

Multiple Choice

Where does the air enter our body?

• Mouth and nose

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Multiple Choice

Where does the exchange of gases (O₂ and CO₂) happen?

• Mouth and nose

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Multiple Choice

Where does the air go after the bronchi?

• Mouth and nose

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Multiple Choice

Where does the air go after the mouth and nose?

• Mouth and nose

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Multiple Choice

In which two tubes is the trachea divided?

• Mouth and nose

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Why does all these happen?

Breathing

Inhale

A muscle called diaphragm goes down and the lungs fill with air

Exhale

A muscle called diaphragm goes up and the lungs put all the air out of the body