THE RESPIRATORY SYSTEM

We breathe in order to take good oxygen into our bodies and get rid off dirty carbon dioxide.

HOW DOES THE RESPIRATORY SYSTEM WORK? The RS is made up of organs in your body that help you breathe. The RS is made up of the trachea, the lungs, and the diaphragm.

When you breathe in air you bring in oxygen, it goes into your lungs and then when you breathe out, you blow carbon dioxide out.

The diaphragm is a muscle beneath the lungs that helps move air in and out of your body.

When you breathe in the diaphragm contracts pulling air into your nose and your mouth through the trachea inflating the lungs like a balloon.

When you breathe out, the diaphragm relaxes and moves up to help push the air out of your lungs and out of your nose and mouth.

The air you breathe passes into smaller tubes that branch within the lungs. These tiny tubes are called the bronchus. There are 30,000 of them in every lung.

There are tiny sacs called the alveoli at the end of each bronchus There are tiny sacs called the alveoli at the end of each bronchus. There are about 300 million alveoli in each lung.

Oxygen in the air you breathe passes through the walls of the alveoli into very small blood vessels called the capillaries.

When the oxygen reach blood is pumped by the body moves in the exact opposite way passing from the capillaries into the alveoli and leaving the body when you breathe out.

The best way to keep your lungs pink and healthy is not to smoke. You can also show your love for your lungs by exercising! As you breathe more deeply and take in more air your lungs become stronger and better.

nose pharynx trachea lung bronchial tube alveoli diaphragm

Write the names of the parts of the Respiratory System (page 149)