The Direction of Gas Movement is Determined By

Question

The direction of gas movement is determined by
A) temperature.
B) size of the gas molecule.
C) solubility of the gas in blood.
D) partial pressure differences.
E) pH.

Accepted Answer

The direction of gas movement is determined by partial pressure differences, specifically the difference in partial pressure between the gas in the lungs and the gas in the blood, or between the gas in the blood and the gas in the tissues. Temperature, size of the gas molecule, solubility of the gas in blood, and pH may all influence gas exchange in some way, but the primary determinant of gas movement is the partial pressure difference.