Blood is made up of
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plasma and red blood cells
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red and white blood cells
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red blood cells, white blood cells and platelets
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plasma and formed elements
Human blood has two parts, fluid and cellular. The fluid part is known as blood plasma, that makes 55% of total blood volume, and the rest are the cellular components. When a sample of blood is centrifuged, results show separation of blood into different layers, based on their density. Three layers are visible after centrifugation is complete. The bottom layer is red colored that is composed of Red Blood Cells (RBCs), above it there's a white band, made up of White Blood Cells (WBCs) and platelets. The third or the topmost layer is a straw colored liquid, that is made up of blood plasma. The cells present in the blood, are also known as formed elements.