If you spin a tube of blood in a centrifuge,which component of the blood is the heaviest?

Question

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If a tube of whole blood is spun in a centrifuge, the formed elements will separate from the plasma. Three layers are formed. Red blood cells (45% of whole blood) are the heaviest, so they settle at the very bottom of the tube. Above the red blood cells is a thin buff-colored layer of white blood cells and platelets (less than 1% of whole blood). Above this layer is the clear, straw-colored plasma (55% of whole blood).

If You Spin a Tube of Blood in a Centrifuge,which