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· (VE) 4 30
Total ventilation · · VE (VT) when breathing O 2 · · VE (VT) when breathing air Tripled Doubled 10 · · VE (VT) (L/min)

Alveolar Po2 when breathing O 2 3 Critical altitude with increased ventilation Altitude gain from increased ventilation Critical altitude w/o increased ventilation PA O 2 Altitude gain from increased ventilation PA O 2 too low 25 15 5 PA O 2 (kPa) Effects

Alveolar Po 2 when breathing air 2 Critical altitude with increased ventilation Critical altitude w/o increased ventilation PA O 2 PA O 2 too low 25 15 5 PA O 2 (kPa) Plate 5.16

Inspiratory pressures 1 Barometric pressure PI O 2 when breathing O 2 PI O 2 when breathing air 25 15 5 kPa

A. Respiration at high altitudes (without acclimatization)

Boiling point of body fluids at 37°C Maximum altitude when breathing O 2 Increased ventilation when breathing O 2 Maximum altitude when breathing air Increased ventilation when breathing air

18 Altitude (km) 16 14 12 10 8 6 4 2 0

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