Gujarat 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:
i. Erythrocytes or red blood cells: They are most abundant blood cells. Normal RBC count is $5-5.5$ million $/ \mathrm{mm}^3$ in males and 4.5-5 million/ $\mathrm{mm}^3$ in females. RBCs help in transport of gases and maintain blood pH .
ii. Leucocytes or white blood cells: The normal WBC count is $5000-6000 / \mathrm{mm}^3$ of blood. They are involved in immune response of body and act as soldiers and scavangers.
iii. Thrombocytes or blood platelets: There are about 2, 50,000 platelets $/ \mathrm{mm}^3$ of blood. They are involved in blood clotting.
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