Question

What makes the blood look red ?​

Answer 1

Answer:

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. ... That's why blood turns bright cherry red when oxygen binds to its iron. Without oxygen connected, blood is a darker red

Answer 2

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Blood contains a pigment called Haemoglobin which makes it red in colour.