HTHSCI 1H06 Lecture Notes - Lecture 13: Gas Exchange, Pulmonary Artery, Pulmonary Vein
4 Apr 2018
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The exchange of gasses between the alveoli, blood and tissues occurs due to differences in the partial pressures of gasses. Atmospheric pressure (barometric pressure = pb: we can measure this because there is a column of air molecules above us and their exert a pressure on us due to gravity. At sea level, barometric pressure is 760 mmhg how much it pushes mercury up test tube. Pb on the moon: 0: no at(cid:373)osphere o(cid:374) (cid:373)oo(cid:374) (cid:373)ea(cid:374)i(cid:374)g there"s (cid:374)othi(cid:374)g pushi(cid:374)g do(cid:449)(cid:374) o(cid:374) disk so there is no barometric pressure there. Gasses move from an area of high concentration to low. Barometric pressure will change from time to time of pressure gets more or less dense, different elevations (more column of air if you are at sea level than if you are on mountain) In a mixture of gasses, each gas will contribute to the total pressure of the system in direct proportion to its percentage in the mixed gas.
