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Why is blood in red colour?

Updated: 11/1/2022
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13y ago

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Blood is not always red. The colour is dependant on it's exposure to oxygen.

If there is oxygen in the blood it has a red colour. That is why whenever you bleed your blood is red, because it reacts with the oxygen in the air. When there is no oxygen in your blood though, your blood has a blue colour.

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13y ago
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13y ago

Blood is red because red blood cells contain a substance called Hemoglobin. Hemoglobin carries O2 (oxygen) from your lungs to the rest of your body. Hemoglobin contains Iron, which when oxidized, turns red

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Q: Why is blood in red colour?
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