Why is the colour of human blood red?

Q. Why is the colour of human blood red?
Answer: Because of haemoglobin
Notes: Human blood is red because it contains a large number of red blood cells, which contain hemoglobin. Haemoglobin is a red-colored, iron-containing protein that functions in oxygen transport by reversibly binding to oxygen. Oxygenated haemoglobin and blood are bright red; deoxygenated haemoglobin and blood are dark red.

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