Purple or blue
The blood becomes red when it gets contact with oxygen
this is why when you get blood drawn it looks purple or blue
The blood is a dark red in most veins. The exceptions are the pulmonary veins, through which oxygenated blood flows from the lungs into the heart, before the heart pumps it around the body.
Blue
Some will say that the blood is blue in the veins because your veins are blue looking. This is incorrect. The blood is in fact red inside the veins, the veins just look blue due to the way the light passes through the fat and skin cells above.
Yes, it could be a sinister sign of a disease It could also be a increased input of blood in your veins
Veins - veins run throughout the body, their main job is to deliver deoxygenated blood to the heart so it can get oxygenated and continue circulation. (They are usually are shown as color blue on the models of the circulatory system) Arteries - arteries are body's largest blood vessels. They main job/function is to take the oxygenated blood from the heart and deliver it to the rest of the body.(arteries branch out to capillaries and other smaller blood vessels).(they are usually shown as color red on models of the circulatory system)
It is an urban myth that unoxygenated blood (in veins) is blue - it is actually dark red.
The only veins that have oxygen in them are the pulmonary veins. The definition of a vein is a blood vessel that carries blood to the heart. This blood is usually de-oxygenated, but the pulmonary veins are the exception.
Veins usually transport blood towards the heart.
veins
Veins are blue in color, they carry deoxygenerated blood which has greater absorption coefficient than the oxygenated blood that runs in artery which is mainly responsible for the blue color.
Veins are not actually darker than arteries. In fact, on dissection, veins and arteries are both a whitish color. The reason that they are more visible is because there are larger veins that are located closer to the surface of the skin than arteries. Veins also tend to have thinner walls, making the blood inside them more visible.
Veins carry blood to the heart. They usually carry oxygen-poor blood.
They both carry blood in them, but veins take blood to the heart, artiries take blood from the heart, usually!
Veins are the blood vessels that usually carry oxygen-poor blood. The exception is the pulmonary vein, which carries oxygenated blood.