APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Exchange of material such as oxygen, nutrients and other waste between blood and tissue occur in capillaries. So the primary function of capillaries is to exchange the material to other body parts. In lungs, capillaries absorb oxygen and release carbon dioxide.

Detailed explanation-2: -Capillaries have walls only one endothelial cell thick, meaning their walls are very thin. This makes them well adapted for gas exchange, as substances only have to diffuse over a short distance. Additionally, there are many capillaries within a capillary bed.