Question

what is diffusion? how does it help in the exchange of gases in lungs ?

without use of Google ​

Answer 1

Explanation:

Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.

Answer 2

Diffusion is the natural movement of gases.

Gas exchange during respiration occurs through diffusion. Gas molecules move from a high concentration to a low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration goes through gas exchange with air in the lungs.