Humans Cannot Survive Long at Altitudes Greater Than 6000 M

question 15

Multiple Choice

Humans cannot survive long at altitudes greater than 6000 m because ________.

• A)the partial pressure of O₂ becomes less than half that at sea level
• B)there is much more CO₂ in the atmosphere at the higher altitudes than at sea level
• C)the diaphragm cannot be contracted enough to produce a full breath
• D)alveoli become compressed at the lower atmospheric pressures

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