Multiple choice

Why does bleeding occur through the nose in high mountainous regions?

  1. The pressure of blood in capillaries is greater than the outside pressure

  2. The pressure at high altitudes is greater than that on the plains

  3. The blood pressure of a person increase at high altitudes

  4. The blood pressure fluctuates and finally decreases drasticlly.
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A Correct answer
Explanation

At high altitudes, atmospheric pressure decreases significantly while blood pressure remains relatively constant. This pressure differential causes blood vessels in the nose (which are delicate and close to the surface) to rupture, resulting in nosebleeds. The external pressure drops more than internal blood pressure adjusts, creating outward pressure on capillary walls.

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