1. The Respiratory System By: Katherine Pease http://www.lung.ca/children/grades7_12/respiratory/respiratory_system.html http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookRESPSYS.html

2. Take a big Breath…. Did your chest move? Why? Why? Your Respiratory system is at work.

3. My what system? Respiratory System –The integrated system of organs involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment.

4. In to other words…. http://kidshealth.org/PageManager.jsp?lic=1&article_set=59300&cat_i d=20607 http://kidshealth.org/PageManager.jsp?lic=1&article_set=59300&cat_i d=20607

5. Let’s Take a trip through your Respiratory System…. follow me

6. First Stop in respiratory system… Air enters the body through the nose, is warmed, filtered, and passed through the nasal cavity. Air can also enter through your oral cavity, your mouth.

7. Second Stop in respiratory system… The Air then passes into the pharynx pharynx Then into the upper part of the trachea –The trachea contains the larynx. larynx

8. In the Larynx are your Vocal Cords. The vocal cords are two bands of tissue that extend across the opening of the larynx. These control the way you sound when you speak.

9. Third Stop in respiratory system… After passing the larynx, the air moves into the bronchi that carry air in and out of the lungs. bronchi

10. Your Bronchi are… Tubes that carry air from the trachea to the lungs (sing.: bronchus trachea These tubes take the air into your lungs

11. Once inside the Bronchi… Air moves into smaller tubes known as bronchioles. bronchioles From there they terminate in grape-like sac clusters known as alveoli. alveoli

12. AlveoliAlveoli are… Alveoli Tiny, thin-walled, inflatable sacs in the lungs where oxygen and carbon dioxide are exchanged. lungs They are surrounded by a network of thin-walled capillaries. capillaries Remember: Capillaries are blood vessels that O 2 and CO 2 diffuse through

13. What helps to move this air in and out of your lungs? That would be your diaphragm. Diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities. Diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities.thoracic

14. How does my diaphragm do this? Through the process of ventilation Ventilation is: The mechanics of breathing in and out through the use of the diaphragm and muscles in the wall of the thoracic cavity.

15. In other words…. When you inhale, muscles in the chest wall contract, lifting the ribs and pulling them, outward. The diaphragm at this time moves downward enlarging the chest cavity. Reduced air pressure in the lungs causes air to enter the lungs. Exhaling reverses theses steps.

16. This a diagram of Ventilation. Also see website to see in action: http://www.smm.org/heart/lungs/top.html

17. Let’s Review….

18. Use this information to fill in your diagram of the respiratory system.