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Gravity allows blood to be separated. Blood is a mixture of Cells and Plasma. Each type of cell and the plasma "weigh" differently. Thus, the heavier more solid blood will sink to the bottom of the tube (RBCs), the lightest liquid part comes to the top (Plasma), and in the middle of the two is where the middleweight Leukocytes settle in.

CELLS: 3 types - Erythrocytes (also called Red Blood Cells or RBCs), Leukocytes (also called White Blood Cells or WBCs), and Platelets. Plasma is 90% water and the liquid part of blood.

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15y ago

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