Biology 105
Biology of Exercise
Spring 2003

Gas partial pressures at increasing altitude

 
Altitude Barometric pressure (mmHg) PO2 in air (mmHg) PO2 in alveoli (mmHg) Arterial Hemoglobin O2 saturation (%) PO2 in alveoli (mmHg) Arterial Hemoglobin O2 saturation (%)
air breathing air breathing breathing 100% oxygen breathing 100% oxygen
0 760 159 104 97 673 100
10000 523 110 67 90 436 100
20000 349 73 40 73 262 100
30000 226 47 21 30 139 99
40000 141 29 12 15 58 87
50000 87 18 2 2 16 22

 

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