What is the primary reason why mountaineers e | vedclass

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(C) At high altitudes,the atmospheric pressure decreases. As a result,the partial pressure of oxygen $(pO_2)$ also decreases significantly compared to

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Decrease in the partial pressure of oxygen

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(C) At high altitudes,the atmospheric pressure decreases. As a result,the partial pressure of oxygen $(pO_2)$ also decreases significantly compared to sea level. Due to this lower $pO_2$,the diffusion of oxygen into the blood becomes less efficient,leading to hypoxia (lack of oxygen in tissues),which causes symptoms like dizziness,nausea,and fatigue in mountaineers. Note that the percentage of oxygen in the air remains constant at approximately $21\%$,but the reduced total atmospheric pressure lowers the partial pressure of oxygen.

What is the primary reason why mountaineers experience difficulty at high altitudes?

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