13 Answer(s)
Poornima Sathe
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Posted 6 year ago Poornima Sathe

Actually, the blood is said to be blue in colour but it becomes blue when it comes in contact to oxygen!

Dhana Pradhan
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Posted 6 year ago Dhana Pradhan

Due to the presence of humoglobin.

Arpan Lepcha
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Posted 6 year ago Arpan Lepcha

Present of hemoglobin

Devendra singh
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Posted 6 year ago Devendra singh Teacher Coach

Each hemoglobin protein is made up subunits called hemes, which are what gives blood its red color

Rachna Dayal
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Posted 6 year ago Rachna Dayal Gurushala Teacher Coach

Each hemoglobin protein is made up of subunits called hemes, which are what gives blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen.

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