1. Respiratory System 2012

2. Breathing Is the movement of air into and out of the lungs Allows your respiratory system to take in oxygen and eliminate carbon dioxide

3. Taking in Oxygen Your body needs oxygen for cellular respiration

4. Eliminating Carbon Dioxide Respiratory system removes CO 2 waste gases from the body

5. Respiratory Organs Pharynx Larynx and trachea Bronchi and lungs Alveoli

6. pharynx A tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth and nose. Epiglottis – a flap of tissue at the lower end of the pharynx. It stops food and liquids from entering your lungs.

7. Larynx and trachea Larnyx is a triangle-shaped structure on which air passes over It’s also called voice box THEN…………. Air enters the trachea

8. Bronchi Trachea branches into 2 narrow tubes called the bronchi that leads into the lungs

9. Lungs Major organs of the respiratory system Bronchi branch into smaller and narrower tubes called bronchioles

10. Alveoli Bronchioles end in microscopic sacs called alveoli This is where gas exchange occurs Gas exchange- oxygen from the air you breathe moves into the blood and carbon dioxide from the blood goes into the alveoli

12. Structure of alveoli Walls of alveoli are one cell thick Blood vessels cover the outside of the alveoli *This is the point of gas exchange

13. How do you breathe? When high levels of CO 2 build up in your blood it signals your nervous system to exhale. Then you inhale. Your diaphragm is a large muscle below your lungs that contracts and relaxes. That’s how the air moves in and out of your lungs. It’s simply a change in air pressure!

14. Review of respiratory system Review of respiratory system