In the circulatory system, veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.
Capillaries
The smallest blood vessels are called capillaries.
The smallest blood vessels in the body are called - capillaries.
They are called capillaries.
Blood vessels that carry blood towards the body tissues are called arteries.
Arteries carry blood to the smallest blood vessels (capillaries).
The smallest blood vessels in the body are called capillaries.
They are called the cappilarys
Vessels with extremely thin walls over wich molecules and atoms are transported are called "capillaries".
veins
Except for the hardest sections of compact bone, bones are living tissue, and so must be provided with oxygen and the materials to maintain or repair themselves. The interior of most bones are an open framework of spongy tissue called trabecular or cancellous bone. In the outer bone, the Haversian Canals form conduits for nerves and blood vessels.
The smallest blood vessels are called capillaries.