In living things, diffusion allows substances to move in and out of cells. It's how red blood cells distribute oxygen through the body. When empty blood cells enter the lungs, which have an ...

Lung plethysmography measures: A lung diffusion test assesses how efficiently oxygen transfers from your lungs into your bloodstream. This involves inhaling a low-concentration carbon monoxide and ...

In contrast, diffusion of gases between inhaled air entering the lungs and capillaries occurs within the lungs. Circulation in the fish is accomplished by a two-chambered heart, whereas a four ...