LINGUIST 3F03 Lecture Notes - Lecture 9: Spirometer, Rib Cage, Pressure Measurement
27 Nov 2018
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Goal: oxygenation of blood, elimination of co2, waste products. Types of respiration: quiet and forced inspiration, passive and active expiration. Passive expiration: system is restored to a resting position after respiration: driven by forces of elasticity, and gravity. Active expiration: muscular effort enhances act of expiration: abdomen is compressed, muscles reduce size of thorax, rib cage is pulled down, air is pulled out of the lungs. Spirometer: used to measure respiration: rate of air ow in respiration, volume, lung capacities. Manometer: force produced when blowing in a tube: measures the pressure. Container is closed on top and open at the bottom, container is placed inside another container that is full of water. Breathing into the tube causes a volume of water to be displaced > give an accurate estimate of the air that was required to displace it. A spirometer cannot measure the residual volume.
