Parts of the Respiratory system


1. The Nose
  • The Nose has three major functions
  • To heat or cool air
  • To moisten air
  • To filter incoming air
  • It is also called the nasal cavity
external image keep-your-nose-out-of-my-business.jpg
2. The Trachea
  • The "Breathing tube" of the respiratory system
  • Starts at the pharynx and goes down to the larynx into each bronchus
  • The trachea is very moist to reduce friction when breathing

3. The Bronchi
  • When the trachea splits, it splits into two tubes
  • These are called the left and right Bronchi
  • Singular- Bronchus
  • The bronchi lead into the lungs

4. The Bronchioles
  • The Bronchioles are smaller tubes broken down from the bronchi
  • The bronchioles lead to tiny air sacs covered with blood (alveoli)

5a. The Alveoli
  • The Alveoli are tiny air sacs at the end of the bronchioles
  • The alveoli are covered with blood
  • They have a lot of elasticity
  • This is the area in which oxygen diffuses into the blood
  • Carbon dioxide diffuses out of the blood

5b. Red blood cells
  • Carries oxygen in the alveoli
  • It's bright color comes from a sticky substance made of iron, called hemoglobin
  • If your blood had problems carrying oxygen, then you most likely have a condition called anemia

6. Other parts of the system
  • The diaphragm- When inhaling, the diaphragm contracts, and helps bring air into the lungs. When exhaling, the diaphragm relaxes
  • The pleura (or pleural cavity)- A closed space within which the lung has grown


external image alveoli.jpgBronchioles and Alveoli

external image lung.gifSimple drawing of inside the lungs