Pulmonary ventilation is higher at altitude than at sea level for any work rate. This is necessary due to the A) colder air. B) lower air density. C) lower O₂ percentage. D) increased viscosity of the air.

Question

Quizplus · Accepted Answer

The lower air density at higher altitudes means that the same volume of air contains fewer oxygen molecules, so the body must breathe more to compensate and maintain adequate oxygen levels in the blood.

Pulmonary Ventilation Is Higher at Altitude Than at Sea Level