1. Respiratory System

3. Do Now:
1. Cellular Respiration happens in our cells. How does the respiratory system make this possible?
2. What is the main job of the respiratory system?
3. What muscle contracts and expands to allow us to inhale and exhale?

4. Respiration: the process by which oxygen (O2) is brought into the body and carbon dioxide (CO2) is removed

5. Nasal Passage
Nose (Nostrils)
Bronchiole
Mouth (Oral Cavity)
Epiglottis
Artery
Larynx (Voicebox)
Vein
Trachea
Bronchi
Lung
Alveoli
Capillaries
Alveoli
Diaphragm

6. Inhalation & Exhalation
Air enters the respiratory system when you inhale through your nose or mouth.
Inhalation occurs when the diaphragm muscle moves down, forcing air into your lungs.
Exhalation occurs when the diaphragm muscle moves up, forcing air out of your lungs.

8. Air Pathway
After inhalation, the air must pass through a series of tubes before it can reach your lungs.
It starts off in one tube called the trachea.
The trachea branches off into two bronchi.
Each bronchi then branches off into many bronchioles.
Each bronchiole ends with multiple alveoli.

9. Gas Exchange
The exchange of gases takes place across the thin, moist membrane of the alveoli.
In order for this exchange to take place, the alveoli are surrounded by capillaries.
Oxygen (O2) diffuses from the alveoli into the blood and carbon dioxide (CO2) diffuses out of the blood into the alveoli.

10. The Alveoli

11. Diseases of the Respiratory System
Asthma/Allergies:
The lining in your airways becomes sore and swollen
During an attack they narrow, causing wheezing, coughing, and trouble breathing

13. Diseases of the Respiratory System
Lung Cancer:
Can start anywhere in the lungs and affect any part of the respiratory system
Caused by:
smoking
exposure to: secondhand smoke, asbestos, radon