what color is blood when its in you and why does it turn red when it hits oxygen?

Answer 1

Your blood is always red. It gets a brighter red when you mix it with air because the haemoglobin in your red blood cells picks up oxygen molecules. But it is always red. Even in your veins - it is just a darker red.

Answer 2

Blood is always red. The color comes from the presence of oxygen in it. The phrase, 'blue blood' refers to venous blood. It is still red, but a much deeper color due to the lesser amount of oxygen. Arterial blood, which is being sent from the heart to feed the body tissue, is the usual red, while venous blood has had the oxygen removed. It is returning to pick up more O2 so it can be sent out again. The brightest red is found in the lungs, and can actually appear almost pink.

So...all blood is red. The only difference is how bright it appears. Arterial is bright because it is full of O2, vein's bring back blood that has dropped off the O2, so it appears dark red. Blood in the capillaries of the lungs is super rich in O2, so it can appear pink. This is a fairly simplified explanation but I hope it helps.

Answer 3

Each red blood cell contains four iron atoms. They attach to oxygen either in your lungs or when exposed to ambient air (a cut). It turns to iron oxide, or rust, which is red. That's what makes your blood red. Unoxygenated blood looks blue or bluish as in a black and blue mark where unoxygenated blood is trapped close to the surface of the skin.

Answer 4

Blood exposed to oxygen is red. Blood within the body , and not exposed to air, is a darker shade of red.

Answer 5

its always red. its a darker red when not oxygenated, this is part of the reason why veins appear blue...also bcus light is diffused by the skin