A person has difficulty in breathing at higher altitudes because

Question

A person has difficulty in breathing at higher altitudes because (A) oxygen is likely to diffuse from lungs to blood (B) oxygen is likely to diffuse from blood to lungs (C) partial pressure of O2 is lower than partial pressure of CO2 (D) overall intake of O2 by the blood becomes low

Tardigrade Admin · Accepted Answer

A person has difficulty in breathing at higher altitudes because overall intake of O2 by the blood becomes low. Although the percentage of oxygen in inspired air is constant at different altitudes, the fall in atmospheric pressure at higher altitudes decreases the partial pressure of inspired oxygen and hence the driving pressure for gas exchange in the lungs.

Q. A person has difficulty in breathing at higher altitudes because

oxygen is likely to diffuse from lungs to blood

oxygen is likely to diffuse from blood to lungs

partial pressure of $O_{2}$ is lower than partial pressure of $C O_{2}$

overall intake of $O_{2}$ by the blood becomes low

Q. A person has difficulty in breathing at higher altitudes because

oxygen is likely to diffuse from lungs to blood

oxygen is likely to diffuse from blood to lungs

partial pressure of O2​ is lower than partial pressure of CO2​

overall intake of O2​ by the blood becomes low

partial pressure of $O_{2}$ is lower than partial pressure of $C O_{2}$

overall intake of $O_{2}$ by the blood becomes low