is blood red or blue?

Answer 1

All blood whether inside the body or out, is RED. Do not believe that it is blue. That is a myth. Read this.

"All blood is red.
Blood with high oxygen content is bright red. (arterial blood)
Blood with low oxygen content is a dull red. (venous blood)
This myth probably started when someone drew a chart of the human
blood system and colored the arteries red and the veins blue. This
myth has been around a long time and seems to have a life of its own."

Here's another one saying the same thing.

"Human blood is red, ranging from bright red when oxygenated to dark red when not. It owes its colour to hemoglobin, a metalloprotein compound containing iron in the form of heme, to which oxygen binds. There exists a popular misconception that deoxygenated blood is blue and that blood only becomes red when it comes into contact with oxygen. Blood is never blue, but veins appear blue because light is diffused by skin. Moreover, the blood inside is dark red and exhibits poor light reflection. From a physiological perspective, veins and arteries appear similar when skin is removed and are seen directly."

Answer 2

Arterial blood after having passed through the lungs and heart is red and contains more oxygen. Venous blood heading from our tissues to the heart and lungs is a darker red with less oxygen. Our veins look blue because we see them through layers of skin, but if you see the blood drawn in a lab for tests from a vein it will be dark red,

Answer 3

Blood is "RED". The blue that appears through your skin is caused by the Oxygen content of your blood.

Answer 4

As soon as blood is exposed to oxygen it turns red. It's blue in the veins though.

Answer 5

Feminine Hygiene Product adverts would have you believe it's bright blue. But it is in fact red.

wiki says this:

The exact color spectra is determined by the relative levels of oxygenated iron (HbO) and CO2 in the blood.

High oxygen reflects red and high CO2 reflects BLUE, which mixed with the yellowish color of the fat and/or skin ends up showing as green (veins).

Answer 6

blood oxidizes, or changes color when exposed to oxygen, in your body blood moving away from the heart (carrying oxygen) is red, blood moving back to the heart (not carrying oxygen) is blue, when you get a cut the blood is exposed to oxygen in the environment and is therefor always red when it is out of the body, when you give blood it is actually carrying oxygen as they are attempting to use the natural pump of the blood to "push" it into the bag, as opposed to the non-oxygenated air that is "pulled" into the heart

Answer 7

Blood is blue while in the veins. If you cut yourself, it comes out red.

Answer 8

Blood is red. Blood carrying carbon dioxide has a bluish tinge, but regains its red color on exposure to oxygen.

Answer 9

red you can see that if you ever give blood it is not exposed to oxygen but is still red in the bag

Answer 10

red