EXAM 4:

Notes

EXAM 4: 1. Alveolar-Capillary Pulmonary capillary surrounds the alveoli 2. Gas Laws 3 factors of gas diffusion (Fick’s law): partial pressure of gases, surface area, thickness of membrane 3. Lung Diffusing capacity DLCO: measures how effectively gas exchange occurs. volume to capacity >80% is unhealthy 4. Perfusion-limited and diffusion-limited gas exchange Limited diffusion: the diffusion rate for O2 and CO2 are decreased (mechanism). Limited perfusion: RBCs are already saturated and cannot participate in gas exchange for a limited time (speed) 5. Lung volumes Tidal volume: resting breaths. Inspiratory reserve volume: additional capacity for deep inhalation Expiratory reserve volume: additional capacity for deep exhalation. Residual volume: the amount of gas that stays in the lungs always. 6. Dead space, physiologic, anatomic (NO FORMULA) Anatomic dead space is areas that cannot participate in gas exchange (bronchi, trachea, nasal cavity) Physiologic dead space anatomic dead space PLUS the alveoli that are already saturated with gas exchange 7. Lung capacities Inspiratory capacity: TV+IRV Expiratory capacity: TV+ERV Functional residual capacity: ERV+RV Vital...