Physiology 1021 Lecture Notes - Lecture 4: Erythropoiesis, Carbamino, White Blood Cell
7 Feb 2016
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The partial pressure of a gas is the pressure exerted by a single gas in a mixture of gases while dissolved in a liquid. Air at sea level exerts an atmospheric pressure of 760 mmhg and. 21 % oxygen, 78% nitrogen and 0. 03% carbon dioxide. Partial pressure of a gas = total pressure of all gasses x the fraction concentration of one gas (that gas divided by 100) Pressure of oxygen at sea level is 159 mmhg. Pressure of carbon dioxide at sea level is 0. 3 mmhg. 5 pressure that maximize simple diffusion across the blood gas barrier: Size of the gradient quicker if it is a large gradient. Thickness of the membrane faster in the membrane in thinner. Surface area larger surface area is larger rate of diffusion. Blood flow is slow in the capillaries is slow. Rate of diffusion (passive) = (gradient x the surface area)/ Effects of changing ventilation on arterial po2, pco2 and ph:
