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Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYStructural Organisation in Animals5 Marks
Question
What are the cellular components of blood?
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Answer

Blood is a fluid connective tissue. It is composed of plasma (fluid) and blood cells (corpuscles). Cellular components of blood (blood corpuscles) constitute about 45% of blood volume.
Three types of blood cells are:
  1. Erythrocytes or red blood cells: They are most abundant blood cells. Normal RBC count is 5-5.5 million/mm3 in males and 4.5-5 million/mm3 in females. RBCs help in transport of gases and maintain blood pH.
  2. Leucocytes or white blood cells: The normal WBC count is 5000-6000/mm3 of blood. They are involved in immune response of body and act as soldiers and scavangers.
  3. Thrombocytes or blood platelets: There are about 2, 50,000 platelets/mm3 of blood. They are involved in blood clotting.

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