KINE 305 Lecture Notes - Lecture 7: Spirometer, Spirometry, Exhalation
Document Summary
Intake o2 and expel co2: large gas exchange surface needed b/c gaseous molecules don"t diffuse very far, lungs: alveoli provide additional surface area for gas exchange, hemoglobin protein in rbcs, binds to o2 in lungs, takes to tissues. In tissues, binds to co2, takes to lungs. Small amount carried by hemoglobin, the rest is carried in the bicarbonate buffer system. Inhalation: diaphragm contracts -> pulls down on lungs (expansion) -> creates a vacuum (neg. pressure) -> air pulled into lungs. Active process (needs energy: exhalation: diaphragm relaxes -> pushes against lungs (shrinking) -> pressure on lungs (pos. ) Use a cardboard tube to breathe into the spirometer. The volume in the lungs at maximal inflation: vital capacity (vc) = tv + irv + erv. Amount of air being used for o2 & co2 exchange: functional residual capacity (frc) = erv + rv. The volume in the lungs at the end of passive expiration.
