Q34. As mentioned, David’s fitness challenge last year was to climb Mt Kilimanja
ID: 3519920 • Letter: Q
Question
Q34. As mentioned, David’s fitness challenge last year was to climb Mt Kilimanjaro - the summit of which is 5895m above sea level. At this altitude, atmospheric pressure is 480 mmHg.
a) Calculate the partial pressure of oxygen at this altitude. How does this compare to the partial pressure of oxygen at sea level? [1 mark]
b) At this altitude, John’s arterial pO2 would be approximately 45 mmHg. Assuming that he hadn’t been there long enough for any kind of adaptation to occur, what effect would this arterial pO2 have on the oxygen saturation of John’s haemoglobin? [0.5 marks]
c) What would happen to John’s ventilation rate during the ascent? Describe the mechanisms by which this change occurs. Describe what happens to alveolar pO2 and pCO2 as a consequence of this change? [2.5 marks]
Could you please show your workings in part A of this question so I can understand better.
Explanation / Answer
the percentage of oxygen at these height are 20.95 %
Total pressure = ?gh + patm
= 1.225 * 9.8 * 5895 = 70769.475 pascal = 530.77 mm Hg
total pressure = 530.77 + 480 = 1010.77 mmHg
now
partial pressure of O2 = 20.95 % of 1010.77 = 211.75 ans
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