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Respiratory System
Structures and functions
| Term | Definition |
|---|---|
| Nose | Filters air by trapping dirt and microbes in the mucus and hairs in our nostrils. It also warms the air up prior to it entering the lungs. |
| Pharynx and Trachea | Air moves from the nose into the pharynx and down the trachea towards the lungs. The pharynx and trachea are both passage ways for air to travel. |
| Larynx | Voice box or Adam's apple, sits on top of the trachea |
| Bronchi | (Bronchus singular) bring the air from the trachea into the lungs. The bronchi branch into smaller tubes called bronchioles. |
| Alveoli | Thin-walled air sacs that extend from the bronchioles and are wrapped in capillaries. Oxygen from the lungs enters the blood stream through the alveoli and capillaries. Carbon dioxide leaves the blood stream through the same capillaries and alveoli. |
| Diaphragm | A muscle that when it contracts (moves down), the lungs expand pulling air into the lungs. When it relaxes (moves up), air is pushed out. |
| Respiration | Function is to bring in oxygen and expel carbon dioxide. This exchange occurs due to the difference in air pressure between the lungs and the external atmosphere. |
Created by:
lcarranza
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