1. Respiratory System & Gas Exchange

2. Lungs Central Organ of the Respiratory System
2 compartments connect outside environment through the trachea
Keeps “external” air separate from internal environment

3. Alveoli Tiny air sacs in the lungs Increase surface area of lungs
Surrounded by capillaries
Responsible for GAS exchange

4. Oxygen Once O2 is absorbed into the blood, it binds to Hemoglobin
Protein found in Red Blood Cells
Delivers oxygen to body

5. Breathing Process Air passes through nose Pharynx Larynx Trachea
Moistened
Warmed
Cleaned
Pharynx
Larynx
Trachea
Bronchial tubes
- One in each lung

6. Breathing Process Bronchioles Alveoli
Oxygen diffuses across alveolar membranes (thin walls) into capillaries
CO2 diffuses from capillaries into alveoli

8. Circulatory/Respiratory System Cooperation
Allow oxygen to enter the blood/body without jeopardizing the health of the cells
Keeps deep body cells away (safe) from external environment

9. Feedback Systems Necessary to retain Homeostasis
Involve all 3 systems discussed
Respiratory
Circulatory
Nervous

10. F.S. Example Breathing Rate During Exercise Processes in body speed up
Production of CO2 increases
CO2 causes the blood to become more acidic

11. F.S. Example Breathing Rate During Exercise Nerve cells detect acidity
Cells send signal to respiratory centers of the brain
Respiratory centers respond by stimulating the diaphragm and rib muscles to contract more rapidly

12. F.S. Example Breathing Rate During Exercise
Breathing rate is increased
Increases rate O2 brought into body and the rate at which CO2 is released
Blood becomes less acidic

13. F.S. Example Breathing Rate During Exercise
Sensory receptors detect pH change
Info is relayed to respiratory centers in the brain
Brain signals diaphragm and rib muscles to slow contraction

14. F.S. Example Automatic response Regulates the acidity of the blood!
You don’t have to think about your breathing rate!
Regulates the acidity of the blood!