What are the functions and features of arteries, veins and capillaries?
Arteries have smaller central cavities than veins and they have a more thicker and muscular walls than veins. Arteries don’t have valves while veins have valves and the blood flows slower,smoother and at low pressure in veins than in arteries. All arteries except pulmonary artery carry oxygenated blood while all veins except pulmonary vein carry deoxygenated blood. Arteries carry blood away from the heart to the rest of the body while veins carry blood to the heart away from the rest of the body. The blood carried by arteries are bright red in colour while the blood carried by veins are dark red in colour. Capillaries are the smallest blood vessels.
