The color of blood is red due to

    • Haemoglobin
    • Neutrophils
    • Esinophils
    • Hematocrit


Red blood cells make up a large portion of blood, which is why it is red. Hemoglobin, a substance found in these red blood cells, is highly reactive to oxygen. The brilliant red colour of the blood is caused by hemoglobin's association with oxygen. When our blood is oxygenated and flowing through our veins, this is why it appears red.

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