Question

why does the nose of a mountaineer bleed at high altitudes

Answer 1

As the altitude increases the atmospheric pressure decrease. And the air becomes thinner and there will be very less oxygen at high altitude. So due to which the blood vessels present inside our their nose bursts and startsbleeding.

Answer 2

as the altitude increases the atmospheric pressure decreases. the air becomes thinner and there will be very less oxygen at high altitude . so due to this the  blood vessels in our nose and bursts and starts bleeding . this is why mountaineers suffer from nose bleeding at high altitudes.

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