PSL201Y1 Lecture : notes
Document Summary
If we look at a cross section through the body, we see how the lungs are situated in the cavity. The diaphragm also seals the bottom of the cavity (the plural cavity) that contains the lungs. As the diaphragm flattens out, it increases the volume of the pleural cavity. the first air we breathe in is the air in this pathway which doesn"t contain a lot of oxygen. Stail air that you breathe first, this volume is about 150ml and is called the dead space. asking the person to breath out normally then breath in as much as they can and then breath out as much as they can, as fast as they can. what people also measure is a ratio of forced expiratory volume in one second. how much air did you breath out in the first second vs. how much air you got out completely in 1 sec (forced vital capacity)
