Question

Why do human beings face difficulty in breathing at high elevations?

• A. Lower % of $O_2$
• B. Low temperature
• C. High pressure
• D. Low $\rho O_2$

Answer 1

The correct option is D Low $\rho O_2$

Difficulty in breathing at high altitude is called altitude sickness. It results from a drop in air pressure and oxygen levels at higher elevations. At high altitudes, the outside air pressure is lower than it is inside the lungs, making it more difficult to pull in the thinner air and for veins to pump oxygen throughout the body. That is why, breathing is difficult in mountain regions.