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Why is blood red?
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Blood is made up of red cells and colourless cells (called white cells), as well as colourless platelets, which make blood clot, and plasma. The red cells get their colour from the iron in haemoglobin, which is the chemical in the blood that carries oxygen and exchanges it for carbon dioxide. In a given quantity of blood, there are a thousand times more red blood cells than white ones.
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Previous:
Back
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Book:
1001
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Section:
Human World
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Chapter:
Human Body: Systems
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