Question

what happens to the efficiency of the exchanges of oxygen in the human body at a high altitude?​

Answer 1

Answer:

Oxygen availability and altitude

Although the percentage of oxygen in inspired air is constant at different altitudes, the fall in atmospheric pressure at higher altitude decreases the partial pressure of inspired oxygen and hence the driving pressure for gas exchange in the lungs.

Answer 2

Answer:

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Explanation:

Ventilatory demand at high altitude

Since barometric pressure decreases, there is less oxygen per volume of gas than at sea level. Thus, supplying the same amount of oxygen for any given rate of work requires that the lungs must take in a greater total volume of air.