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  • Smart Learning for All

  • Topic: Centrifugation.

  • How is the principle of centrifugation helpful in blood banks?

  • Do you know that jelly is a colloidal solution?

  • A colloidal solution is a solution whose particles neither dissolve nor settle down.

  • Another example of a colloidal solution is blood.

  • Blood consists of various components like red blood cells, white blood cells, platelets, plasma, etc.

  • Which neither dissolve nor settle down.

  • Usually, in blood banks, when a blood sample needs to be tested, its components have to be separated.

  • So, how can we separate those components?

  • What do you think?

  • Can we use a filtration technique to separate various components of blood?

  • No, filtration is not useful because the size of the components of blood is so small.

  • That they can easily pass through the filter paper.

  • Similar to this merry go round.

  • A machine called centrifuge is used in blood banks to separate blood components.

  • In the centrifuge machine, a test tube filled with a blood sample is rotated at a constant high speed.

  • This process is called centrifugation.

  • Centrifugation is based on centripetal acceleration.

  • Due to centripetal acceleration, the heavier components, that is, the red blood cells move outwards.

  • The white blood cells and platelets which are lighter than red blood cells form the middle layer.

  • Plasma being the lightest moves towards the center.

  • In this way, components of blood get separated by the principle of centrifugation.

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