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The plasma is the river in which the blood cells travel. It carries not only the blood cells but also nutrients (sugars, amino acids, fats, salts, minerals, etc.), waste products (CO2, lactic acid, urea, etc.), antibodies, clotting proteins (called clotting factors), chemical messengers such as hormones, and proteins that help maintain the body's fluid balance.
When you spin blood in a centrifuge, the red cells go to the bottom of the container, and the white cells and platelets to the middle, leaving the yellowish plasma at the top.
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Plasma
