Question

4. Explain with reasons.
a. Human blood is red coloured
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Answer 1

Answer:

Human blood has a substance called haemoglobin which gives the blood its red colour...

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Answer 2

Answer:

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Explanation:

Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that's crucial for carrying oxygen through your bloodstream. Heme contains an iron atom which binds to oxygen; it's this molecule that transports oxygen from your lungs to other parts of the body.