Mountaineers suffer from nose bleeding (epistaxis) at higher altitudes. Explain.

(N/A) As altitude increases,the atmospheric pressure decreases. At high altitudes,the external atmospheric pressure is significantly lower than the pressure exerted by the blood within the body's blood vessels. The walls of the capillaries in the nasal passage are very thin. Because the internal blood pressure exceeds the reduced external atmospheric pressure,these thin-walled capillaries rupture,leading to nose bleeding.