Question : The red colour of human blood is due to_____________.
Option 1: Myoglobin
Option 2: Haemoglobin
Option 3: Immunoglobulin
Option 4: Haptoglobin
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Correct Answer: Haemoglobin
Solution : The correct option is Haemoglobin
The red colour of human blood is caused by a molecule known as haemoglobin . The protein haemoglobin is present in red blood cells and delivers oxygen from the lungs to the rest of the body's tissues and organs. Haemoglobin also aids in the transfer of carbon dioxide, a byproduct of metabolism, back to the lungs for expiration. The red colour of haemoglobin is a result of its iron content. When it binds with oxygen in the lungs, it forms a complex called oxyhaemoglobin, which is bright red.
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