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5. How to explain that a venous blood looks purplish blue and an arterial blood appears bright red to us? 6. Why is CO a high
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5. The difference in color arises due to the electronic state of iron in deoxygenated blood (ferric) and oxygenated blood (ferrous) which influences the electron transitions making the colors change happen

6. CO has a higher affinity to haemoglobin than Oxygen meaning that an excess of CO will complex with all the haemoglobin leaving no Complex sites for Oxygen, essentially suffocating a person

7. Bilirubin breaks down Red blood cells

Chlorophyll is important in capturing sunlight for photosynthesis

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