PSL301H1 Lecture 15: Respiratory Lecture 3 (15)
23 Mar 2016
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Lecture 3: respiratory system gas exchange and gas transport (600-615) Recall the function of the respiratory system to exchange co2 for o2 and to oxygenate blood. Po2 = fo2 x pb (which is normally 760 mmhg at sea level: fo 2 = 21%; po2= 159. 6 mmhg. Po2 = fo2 x pb: fo2 = 21, po2 = 150 mmhg. Pco2 = fco2 x pb: fco2 = 0. 04, pco2 = 0. 29 mmhg. How much oxygen and carbon dioxide is in alveoli. In the alveoli, you do not exchange 100% of the air with every breath: the figure shows the real value of po2 and. Pco2 in the alveoli (100mmhg and 40 mmhg: this is what we work with in the alveoli. If the system is closed overtime you"d get the same po2 of the water, and of the air (the actual amount is 0. 15 mmol/l. 1: for co2, it"s more soluble in water, so you have more of co2.
