EXSS1032 Lecture Notes - Lecture 8: Fraction Of Inspired Oxygen, Calorimetry
4 Sep 2018
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Measuring heat production to determine metabolic rate in living organisms. Measuring oxygen consumption and carbon dioxide production to calculate metabolic rate in living organisms. Relationship between oxygen consumption and burning of fuels. Inspiration: o2 - 20. 93%, co2 0. 03%, n2 - 79. 04% Expiration: o2 0. 1643, co2 0. 0421, n2. We utilise oxygen in the body therefore there is less oxygen in the expired air. Carbon dioxide is produced as a waste product in the body therefore there is more carbon dioxide in the expired air. Nitrogen is always the same in expired air as in the inspired air. As we increase temperature, volume increases (charles law) Pressure and volume are inversely proportional at a given mass (boyles law) Temperature = ass 273 to measured temperature to convert to kelvin. Vestpd = veatps x pb ph2o x 273. Minusing ph2o removes influence of humidity (water vapour) Relied on because nitrogen concentration does not change in inspired air to expired air.
