1. Respiratory System Gas exchange

2. Why do we breathe? Think of all the reasons why we need a respiratory system. WORKTOGETHERWORKTOGETHER

3. Respiratory System Functions: Provides oxygen to the blood Removes CO 2 from the blood

4. Cells Many different types of cells are formed during embryonic development.

5. Organization of the Body Levels of Organization Eleven Organ System

6. Levels of Organization Molecule Cell Tissue Organ Organ system Organism

7. Homeostasis The body maintains stable internal conditions which are relatively constant

8. Homeostasis & the Respiratory System body = trillions of cells: needs FOOD (digestive) and AIR (respiratory) Cellular Respiration: C6H12O6 = O2  CO2 + H2O + ATP THEREFORE supply of O2 in blood CRITICAL for homeostasis Without O2, cells cannot make energy CO2 must also be managed so that this waste doesn’t accumulate to problematic levels.

9. Respiratory System Organs Alveoli Bronchi Bronchioles Diaphragm Larynx Lungs Nose Trachea

10. Structure Bronchioles Bronchi/Bronchus

12. Warning: terminology! “Respiration” is used several different ways: Cellular respiration is the aerobic breakdown of glucose in the mitochondria to make ATP. Respiratory systems are the organs in animals that exchange gases with the environment. “Respiration” is an everyday term that is often used to mean “breathing.”

13. Moving air in and out During inspiration (inhalation), the diaphragm muscle moves DOWN During exhalation, these muscles relax. The diaphragm moves upwards.

14. Trivia When a person inhales... a.the chest cavity becomes bigger b. the chest cavity becomes smaller c.it is impossible to breathe d.none of the above

15. Alveoli The alveoli are thin- walled pockets which are the site of gas exchange.

16. Gas exchange Air entering the lungs (alveoli) has more O2 & less CO2 than the blood that flows in the pulmonary capillaries How do these differences in concentrations assist gas exchange?

17. Trivia The actual exchange of gases occurs at the site of the... a.Trachea b. nasal passageway c. larynx d.alveoli

18. Circulation and Gas Exchange Gas exchange at the lungs moves oxygen into cells and carbon dioxide out (Diffusion) Clear connection between circulation and the respiratory system.

19. Oxygen transport Hemoglobin= iron in blood Hemoglobin binds to O2 that diffuses into the blood stream. Red blood cell transports oxygen to all body cells

20. Trivia Gas exchange occurs when... a. oxygen in the alveoli diffuses into the blood in the capillaries b. oxygen binds with the hemoglobin in the red blood cells c. the red blood cells give up oxygen to the cells of the body tissues d. all of the above

21. Most of the oxygen in blood is: 1.In the white cells. 2.Bound to hemoglobin. 3.Combined with carbon to make carbon dioxide. 4.Dissolved in the plasma.