Final answer:
A centrifuge is used to separate blood into its components. By spinning the blood at high rotations, the blood cells and platelets are forced to the bottom of the specimen tube, while the plasma remains at the top.
Step-by-step explanation:
A centrifuge is a rotating device that utilizes centrifugal forces to separate specimens of different densities. By spinning the blood at high rotations, the blood cells and platelets are forced to the bottom of the specimen tube, while the upper liquid layer, known as plasma, remains at the top. This separation process allows for the isolation of various blood components, including plasma, white blood cells, platelets, and red blood cells.