to allow gas exchange (oxygen and carbon dioxide)
only metabolic wastes out of the capillary
The arterial and capillary walls are incredibly strong. This is true otherwise you would be bleeding just by tapping yourself.
they have skinny walls
500
neutrophils
diapedesis
Osmosis
Capillary walls receive oxygen in the lungs by a process known as diffusion.
bronchials
Capillaries in the circulatory system have the thinnest walls in the body, allowing for the exchange of nutrients and waste products between blood and tissues.
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.
Capillary walls & Cell membranes