Discussion
Mountaineers suffer nose bleeding at higher altitudes because :
Answer: A
Nose bleeding happens because the pressure in blood vessels exceeds outside pressure.
Air pressure falls with altitude. At great heights the pressure of the blood inside the body becomes much greater than the air pressure outside, and the thin, delicate blood vessels in the nose can burst. The dry, cold air of high mountains adds to the effect.
The blood pressure does not fall below or equal the outside pressure, and blood thickening is not the reason given for nosebleeds.
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