PATHOLOGY

Detailed explanation-1: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-2: -That is, oxygen will diffuse preferentially within the portions of cells and tissues where it is most abundant and able to diffuse most readily. Further, because diffusional flux depends on permeability, we can expect the rate of oxygen transfer to be greatest along such preferential diffusion pathways.

Detailed explanation-3: -The exchange of oxygen, nutrients, and waste between your blood and tissues also happens in your capillaries. This happens through two processes: Passive diffusion.