Recall...

1. Recall...

2. Why is diffusion important? - Gas exchange b/w a living cell & the environment always takes place by diffusion across a moist surface. - The rate of diffusion depends on 3 major factors: 1) Surface areaof the cell membrane. 2) Concentration gradient(difference in concentrations of O2 & CO2 gases on either side of cell membrane) 3) Diffusion distance

3. How is Oxygen Transported in Blood? Oxygen (O2) Alveolar wall Capillary cells Blood plasma Red Blood Cells

4. Haemoglobin (Hb) • Greatly increases our oxygen carrying capacity • - Most O2 binds to Hb forming oxyhemoglobin • O2+ HbOxyhemoglobin • Oxyhemoglobinis transported to the body cells (i.e. muscle cell) where O2 is released • - CO2 is picked up from the body cells for transport back to the lungs

6. Respiratory Disorders & Technologies • Disorders: • Asthma • Chronic Obstructive Pulmonary Disease (COPD) • Influenza • Tubeculosis • Pneumonia • Cystic Fibrosis • Technologies: • FLAP Inhibitors • Bronchial Thermoplasty • Artificial Lungs • Lung Transplants

7. Asthma

8. Influenza (“the flu”)

9. Tuberculosis (TB) Myobacterium tuberculosis

10. Pneumonia

11. Cystic Fibrosis

12. FLAP Inhibitors BronchialThermoplasty

13. Artificial Lungs

14. Lung Transplants