Which of the following has the lowest partial pressure in inhaled dry air?
A) oxygen
B) nitrogen
C) water vapor
D) carbon dioxide
E) mercury

Question

Quizplus · Accepted Answer

Carbon dioxide has the lowest partial pressure in inhaled dry air compared to the other options. The major components of inhaled dry air are nitrogen (about 78%) and oxygen (about 21%), with very small amounts of carbon dioxide (about 0.04%) and even smaller traces of other gases. Water vapor content can vary, but in dry air, its partial pressure would be higher than that of carbon dioxide. Mercury is not a gas at room temperature and thus would not have a partial pressure in air.

Which of the Following Has the Lowest Partial Pressure in Inhaled