PHGY 312 Lecture Notes - Lecture 1: Mass Diffusivity, Circulatory System, Intercostal Muscle
24 May 2016
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150mmhg out of 760 mmhg in atmosphere is oxygen. Diffusion coefficient for co2 is higher than o2. The greater the radius of the cell, the surface area increases by the squared by the volume by r^3 o. Surface: volume ratio becomes really small as you keep increasing radius. Need some sort of convection: water comes in and gets expelled, speeding diffusion. Carrier need a pump (heart, chest wall, etc) Quantity of a gas in liquid =vcarrier x alpha (x) x p (x) Diffusion from environment (mother) into our own blood and then into cell = all fetus/embryos o. Oxygen consumption is increased dramatically right before birth. Upper and lower airways add to the shift to convection in addition to the cardio convection o. Convection needs pumping mechanisms, the work of which requires energy consumption o. Thermo activity not lost through convection as long as gas composition is not changed.
