Question

why is the colour of blood red ​

Answer 1

It is because of haemoglobin present in the blood.

Each hemoglobin protein is made up subunits called hemes, which are what give 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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Answer 2

Answer:

The colour of the blood is red because of the presence of a red coloured pigment called haemoglobin present in the RBCs.

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