We do not feel uneasy even under the enormous pressure of atmosphere above as well as around us. Give a reason.

We do not feel uneasy even under the enormous pressure of atmosphere above as well as around us because the pressure of our blood balances it. The blood pressure is slightly above the atmospheric pressure.

However, at high altitude, the atmospheric pressure becomes less because the height of air column above that altitude is less than at the earth's surface. As a result, at high altitudes the blood pressure becomes much more than the atmospheric pressure and nose bleeding may occur due to excess blood pressure.