Is the blood blue inside the body?

Answer 1

It's not really blue. The changes in blood coloration you're describing relate to the respiratory pigment, hemoglobin. Hemoglobin is a topologically complex molecule that very readily binds to oxygen. Once the molecule is fully saturated, it reflects in the crimson red spectrum, and therefore fully oxygenated blood appears to be bright red. After the hemoglobin molecule gives up its oxygen to tissue that needs it, the molecule becomes much less reflective, and thus deoxygenated blood appears very dark red to purple, or almost black. Blue is used in charts and diagrams to contrast against red, red being the arterial system bearing O2 and blue being the deoxygenated blod or venous system.

Answer 2

No, human blood is never blue. It is vivid red when oxygenated, and a dark red when deoygenated.

The 'blue blood' misconception comes from the blue appearance of veins through the skin. This is an optical illusion caused by the skin absorbing different levels of red and blue light.

Answer 3

Veins close to the surface of the skin appear blue for a variety of reasons. However, the factors that contribute to this alteration of color perception are related to the light-scattering properties of the skin and the processing of visual input by the visual cortex, rather than the actual color of the venous blood.

Answer 4

No, not in a human it isn't. The blue appearance of our veins is due to the way light is absorbed and reflected through the fat layers of our skin. Some people might even be mislead by typical diagrams which colour the veins blue to differentiate them from the arteries.

As anyone who has had blood taken will know, veinous blood is dark red. It would be a stretch to call it purple, and to think it is truly a deep royal blue is just false.

Answer 5

Your blood is always red. In arteries it is high in oxygen and is lighter red. The reason it seems blue inside the vein you is because you are looking through it through your skin and your vein wall. It is actually dark red.

Answer 6

Because it's

blood without oxygen

disregard the above answer, if your blood had no oxygen you wouldn't be alive, blood is never blue. its totally ridiculous for anybody to say blood is blue. its always red. have you ever seen blue blood

Answer 7

Your blood is blue and some of it is red. the blood from your heart is blue. blood that interacts with your lungs is red because it interfears with the oxygen.

Answer 8

The blood in you is blue because it is de-oxiginated, but when you get cut and it is exposed to the air it turns red. That's why on charts of people's body's there's red veins and blue veins.