1. 6.4: GAS EXCHANGE

2. Sketch and label a diagram of the ventilation system, including: Trachea, right/left lung, bronchus, bronchioles, ribs, intercostal muscles, diaphragm.

3. Ventilation Maintains the concentration gradients for oxygen and carbon dioxide in both the lungs and the blood. Introduction to the lungs short video. http://highered.mheducation.com/sites/0072495855/student_vie w0/chapter25/animation__gas_exchange_during_respiration.html Sketch figure 1, page 311. This diagram shows the structure of the alveoli (small air sac in the lung/site of gas exchange) Label the pneumocytes type I and type II

4. You are full of HOT AIR! You have 30minutes to complete this activity

5. Type I and II pneumocytes Type IVery thin, alveolar cells adapted for gas exchange. Most of the cells in the epithelium of an alveolus are type I. Appear flattered, 0.15µm thickness. Type IISecrete a solution (surfactant) that maintains the moist surface inside the alveoli. Only make up 5% of alveoli surface.

6. Pressure changes during ventilation Muscle contractions cause pressure changes within the lungs during inhalation/exhalation. http://highered.mheducation.com/sites/0072507470/student_vie w0/chapter23/animation__alveolar_pressure_changes_during_ins piration_and_expiration.html

7. TASK: Causes and consequences Class will divide in two: 1.Lung cancer 2.Emphysema Next class you will be teaching each other about the causes and consequences of Lung cancer and emphysema. Make you lesson FUN! 20 minutes per group MAX.

8. http://science.nationalgeographic.com/science/he alth-and-human-body/human-body/lungs-article/

9. QUIZ next class – non-graded.