Source: Capillaries; Public Domain: http://en.wikipedia.org/wiki/File:Illu_capillary.jpg Capillary bed
Tubes that transport blood throughout the body.
Vessels of the largest diameter that carry blood away from the heart.
Smaller vessels that branch from arteries that carry blood away from the heart.
The smallest vessels that act as zones of diffusion between blood and tissues.
Small vessels that merge with capillaries to carry blood back to the heart.
Large diameter vessels that return blood back to the heart and contain valves to prevent backflow of blood.
The surge of pressure felt in an artery when ventricles of the heart contract.