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What is the composition of blood?

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What is the composition of blood?
posted Mar 22, 2018 by Entertainment And Studies

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1 Answer

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Blood consists of two main components:

  • Plasma, which is a clear extracellular fluid
  • Formed elements, which are made up of the blood cells and platelets

The formed elements are so named because they are enclosed in a plasma membrane and have a definite structure and shape. All formed elements are cells except for the platelets, which are tiny fragments of bone marrow cells.

Formed elements are:

  • Erythrocytes, also known as red blood cells (RBCs)
  • Leukocytes, also known as white blood cells (WBCs)
  • Platelets

Leukocytes are further classified into two subcategories called granulocytes which consist of neutrophils, eosinophils and basophils; and agranulocytes which consist of lymphocytes and monocytes.

The formed elements can be separated from plasma by centrifuge, where a blood sample is spun for a few minutes in a tube to separate its components according to their densities. RBCs are denser than plasma, and so become packed into the bottom of the tube to make up 45% of total volume. This volume is known as the haematocrit. WBCs and platelets form a narrow cream-coloured coat known as the buffy coat immediately above the RBCs. Finally, the plasma makes up the top of the tube, which is a pale yellow colour and contains just under 55% of the total volume.

answer Mar 22, 2018 by Salil Agrawal
Ok sir but I had done this answer in4 hour before
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