is blood inside a human body blue??

Question

me and my friend have an argument i say the blood is red and he says the blood is blue wich one of us is correct?

Answer 1

Blood in veins is dark red.
Blood in arteries is bright red.

Heme (in hemoglobin) is a red pigment.

Answer 2

To put it simply, some of your blood is blue, and some is red. Blood statrs out blue, but turns red when it is given oxygen from the lungs. This is why some of your veins are red and some are blue. The blue ones are sending the blood around the body, eventually to the lungs, while the red veins are transporting red blood which has already been oxygenised.

Answer 3

Contrary to popular belief, the colour of blood inside the body, no matter how you look at it is red. Blood is bright red when oxygenated and dark red when it lacks oxygen.

When you look at blood through your skin it may look blue, but that is the result of how colour wavelengths travel through and are reflected by the skin. To see a vein at all, light must pass through the skin and hit the blood in the vein. The blood then absorbs certain colours of light and reflects others back through the skin.

In blood, longer, redder wavelengths can go more deeply into the skin than shorter, bluer wavelengths before being reflected. Therefore, a blood vessel below the skin looks blue because the blue light is reflected.

In reality, blood is either dark or bright red, depending on the amount of oxygen. When blood passes through your lungs, oxygen surrounds the haemoglobin turning your blood bright red. Also when blood is exposed as in the air, like when you cut your finger, it turns bright red.

However, as blood moves through your body to nourish tissues, which reduces the amount of oxygen in the blood, it turns a darker shade of red

Answer 4

Blood is always red.

Here's a way to think about it: oxygen runs through our veins. Thus, the myth about blood being blue and becoming red when it hits oxygen doesn't make the least bit of sense, as blood is ALWAYS exposed to oxygen.

Answer 5

Blood lacking in oxygen is a darker red, and oxygenated blood is bright red. It is never blue. (The reason it looks blue in your vessels through your skin is due to the color of the vessels, not the blood inside them.)

Answer 6

It is is a very dark maroon. When air hits blood it turns red.

I think some people who gave thumbs down to the ones who said blood is not blue need to look at a book on physiology or biology.

Answer 7

It isn't actually blue, but it is such a dark redish color that it seems to be blue. The blood in our bodies are blue until oxygen touches it's surface, and then it turns, of course, red.

Answer 8

NO

Blood is always red

Answer 9

red

Answer 10

i heard oxygen turns it red in college biology. i wonder if any blue blood is in a lab someplace?