LING 2P90 Lecture Notes - Lung Volumes, Abdominal Wall, Spirometer
24 Nov 2012
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Passive: no muscle are involved no muscle contractions involved at all. Active: muscles are involved typical muscle contraction changes in air pressure etc, pressure=the force divided by the area, whatever you do to pressure you have to do the opposite to the area . You decrease the area you increase the pressure. Intra(pleura: between visceral and thoracic (costal) pleurae. Transdiaphragmatic: pressure difference across the diaphragm, the difference in pressure across the diaphragm = the pressure in the abdomen and the pressure in the pl. Circumference of the rib cage wall increase on inhalation. Circumference of the rib cage wall decreases on exhalation. Possible because of two joints: costo-central joints, costo-transverse. Pump-handle (the movement of an old water pump: vertical movements at front. Relative movements: palv (pressure alveolar) influences by percentage contact rc (rib cage) & ab (abdomen) have with lungs. Lung capacities: can measure lung volume with, wet spirometer.
