They connect blood vessels together! :D
They are both very thin making diffusion possible.
Vessels with extremely thin walls over wich molecules and atoms are transported are called "capillaries".
Supplier of Human Blood Products and Components
continuous capillaries continuous capillaries
They are only one cell thick and have very thin walls, to allow nutrients and oxygen to diffuse out of them.
Capillaries The smallest of the blood vessels: capillaries.
Capillaries are the structures that connect arteries to veins.
Arteries "feed" the capillaries while veins drain the capillaries.
plmonary veins begin as capillaries and end as capillaries
Sinusoidal Capillaries
The thin walled blood vessels are called capillaries.
continuous capillaries