1. The Respiratory System

2. Structure of the Respiratory System

3. lung bronchial tubes nose mouth trachea diaphragm
A. lung B. bronchial tubes C. nose D. mouth E. trachea F. diaphragm Carlyn Iverson (Pronunciation Key)respiratory system n.
The integrated system of organs involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment.

4. Breathing in and out
Breathing is controlled by the respiratory centre of the hindbrain. This area controls the movement of the diaphragm, a muscular sheet which seals the thorax. When the diaphragm contracts, it pulls the lungs downwards and air is forced into the trachea, bronchi and bronchioles. When the diaphragm relaxes, the air is forced out of the lungs and the cycle repeats itself.

5. (3) What happens to the rib cage when you exhale?
(1) What happens to the rib cage when you inhale?
(4) What happens to the diaphragm when you exhale?
(2) What happens to the diaphragm when you inhale?

6. The Trachea
The trachea (also called your windpipe) is the tube that connects your mouth to the tubes that go into your lungs.
At the top of the trachea is your larynx (voice box).
The tube is surrounded by rings of cartilage to stop it from getting crushed.
The trachea splits into two main tubes – the bronchus. They divide into smaller tubes called bronchi.

7. The Lung These tubes continue to split. The order goes…. Trachea
(biggest tube)
Bronchus
Bronchi
Bronchiole
(smallest tube)

8. The Lung

9. The main tubes of the lung

10. The tubes of the lung

11. The lung including air sacs