The respiratory system

In addition to nutrients, we need oxygen to live.
We breathe to obtain oxygen from the air.
This function is carried out by the respiratory system.
It is made up of the nose, air passageways (the tubes which carry air in and out of the body), and the lungs.

• First, the air enters through the nose. Then it passes through the pharynx, the larynx, and the trachea.
Next, it goes through the two main bronchi and into each lung. In the lungs, the bronchi divide into smaller bronchioles. There are tiny sacs of air at the end of the bronchioles called alveoli.

• In the alveoli, oxygen from the air passes into the blood.
The blood releases carbon dioxide which passes into the alveoli.
It is toxic, and the body expels it.

Two movements, inhalation and exhalation, cause the air to circulate.
When we inhale, our lungs fill with air.
When we exhale, air leaves the lungs

What is the respiratory system?      Your respiratory system is made up of the organs in your body that help you to breathe. Remember, that Respiration = Breathing. The goal of breathing is to deliver oxygen to the body and to take away carbon dioxide. Parts of the respiratory system Lungs      The lungs are the main organs of the respiratory system. In the lungs oxygen is taken into the body and carbon dioxide is breathed out. The red blood cells are responsible for picking up the oxygen in the lungs and carrying the oxygen to all the body cells that need it. The red blood cells drop off the oxygen to the body cells, then pick up the carbon dioxide which is a waste gas product produced by our cells. The red blood cells transport the carbon dioxide back to the lungs and we breathe it out when we exhale.

Trachea      The trachea (TRAY-kee-uh} is sometimes called the windpipe. The trachea filters the air we breathe and branches into the bronchi. Bronchi      The bronchi (BRAHN-ky) are two air tubes that branch off of the trachea and carry air directly into the lungs. Diaphragm      Breathing starts with a dome-shaped muscle at the bottom of the lungs called the diaphragm (DY-uh-fram). When you breathe in, the diaphragm contracts. When it contracts it flattens out and pulls downward. This movement enlarges the space that the lungs are in. This larger space pulls air into the lungs. When you breathe out, the diaphragm expands reducing the amount of space for the lungs and forcing air out. The diaphragm is the main muscle used in breathing. FANTASTIC FUN FACTS!!!