Diffusion ;)
diapedesis
Diapedesis
they squeeze through capillary walls in a process called diapedesis
Capillary walls receive oxygen in the lungs by a process known as diffusion.
neutrophils
Osmosis
diapedesis
The capillary walls are the thinnest blood vessels to allow the exchange of materials.Capillary walls only have a single layer of endothelial cells (the flattened layer of cells that line the closed spaces in the body). This is unlike the arteries and veins which have multiple layers such as smooth muscle, elastin, and connective tissues. The thin walls allow for oxygen and waste products (such as carbon dioxide) to diffuse between the tissues and blood.
Thin walls to allow gases to diffuse across them
diffusion
Diffusion.
They are designed to exchange materials such as the alveoli exchange gases or the capillary walls exchange fluid and nutrients with the intestitial tissues.