Question

What is partial pressure? How does it help in gaseous exchange during respiration?

Answer 1

In a mixture of gases, the partial pressure is the amount of pressure each gas would exert if it were the only gas in the volume or we can defined as, it is the pressure exerted by each of the constituents of a mixture of gases. Partial pressure is related to the gaseous exchange of respiration i.e, as air moves into the alveoli, water vapor and carbon dioxide are added, and that reduces the partial pressure of oxygen to about 100 mmHg in the alveolar gas.