Revision of the how the respiratory system works.

HOW THE RESPIRATORY SYSTEM WORKS.

The Process:

1. As we breathe in, air goes into our mouth and nose.

2. The air travels down the trachea into the bronchi.

3. The air passes from the bronchi into the bronchioles.

4. Oxygen is absorbed into the blood.

5. Carbon dioxide passes from the blood to the bronchioles.

6. We breathe out and expel carbon dioxide.

The Parts:

1. Mouth and nose: air enters the body through the mouth and the nose.

2. Vocal cords: as air passes our vocal cords, they vibrate and enable us to speak.

3. Trachea: this long, rigid tube connects our mouth and nose to our two bronchi. Air travels down the trachea into the bronchi.

4. Bronchi: these two smaller tubes connect the trachea to the lungs.

5. Lungs: these two large bags are connected to the bronchi. The bronchi branch into millions of smaller tubes, or bronchioles, here in the lungs.

6. Bronchioles: these are smaller tubes inside the lungs. At the end of each bronchiole, there are tiny sacs called alveoli. The air we breathe goes into these tiny sacs and then passes into blood vessels with surround them.