Veins are bigger and thicker than artires
artries
Heart pumps O2 rich blood to body through artries.
Veins are actually more transparent than anything else. Veins appear blue due to the way the deoxygenated blood (Dark Red in color--not blue) and subcutaneous fat (fat under the skin) absorb light. They absorb all colors except the blue that you see.
Arteries carry oxygenated blood away from the heart, to the cells that need them. Veins carry blood containing carbon dioxide back to the heart after the oxygen has been given to the cells. Capillaries are the thinnest arteries and veins. They are only one cell wide. As the blood cell passes through the very thin capillary, the cells on either side are given oxygen and carbon dioxide is taken from them. Therefore, the capillaries connect the arteries and veins. Veins are thinner than arteries. Arteries are thicker than capillaries.
artries(aorta)
Structural similarities between artries and veins are1) The walls of arteries and veins both contain collagen which makes them strong and durable.2) They both contain elastic fibres which allow them to stretch and recoil.3) Their walls contain smooth muscles that enable them to constrict and dilate.4) They are both three - layered.
Blood flows the fastest in the arteries because they have thick muscular walls that help propel blood throughout the body at high pressure.
those blood vessels that goes against the artries...
No. There are structures in plants that are called veins, but they work considerably differently from those in humans.
even though the arteries and veins aren't organs,they would be the heart,veins,and the arteries.
Arteries carries pure ie oxygenated blood to all parts of the body.
veins have valves because they bring blood from the bottom half of your body and valves stop the back flow of blood since the veins work against gravity.