why is blood red ?

Answer 1

Heme,
Hemogloblin is a pigment in blood that carrys O2 and CO2 it also gives the color red.

IT IS A MYTH THAT BLOOD IS BLUE-not true
when not oxegenized it is deep red, and when oxenginized it is brighter red.

Answer 2

The hemoglobin molecules in Red Blood Cells have chemical properties such that, when they have Oxygen bound to them, absorb all wavelengths of light EXCEPT red, which they reflect. This reflection is why blood appears red.

Interestingly, when there is NO Oxygen attached to the hemoglobin, the shape of the hemoglobin changes so that the blood is dark-red, even slightly bluish... which is why your veins appear blue under your skin.

Answer 3

Because the molecules that carry oxygen in mammals and may other animals use iron, hence the red color. Some other animals such as mollusks and arthropods use copper compounds, and have truly blue blood.

Answer 4

It contains red blood cells which contain hemoglobin. When it is combined with oxygen, it is bright red.

Answer 5

It turns red after it comes in contact with oxygen. That's why some arteries are blue (blood that hasn't gone through the heart).

Answer 6

I was once told that blood is blue. It isn't red until oxygen hits it.

Answer 7

blood cells are red only because they contain a protein chemical called hemoglobin which is bright red in color.

Answer 8

It's only red when it comes in contact with the air. Inside it's blue. Why is it blue?

Answer 9

It's actually blue, but when it comes to the surface the oxygen turns it red. That's why your veins look blue.

Answer 10

really it isn't red it is blue, but whn oxygen hits it it turns red