1.

Describe five types of leucocytesm,with the help of diagrames,Add a note on their functions.

Answer» Leucocytes or white blood corpuscles (WBCs) ( leukos-white kytos-cell )
1. Leucocytes are colourless,nucleated,amoeboid and phagocytic cells.
Due to their amoebid movement they can squeeze out of blood capillaries.This is called diapedesis
3. The size is about 8 to 15 ` mu m`
There are about 5000 to 9000 WBCs per cubic mm of blood, This is called total WBC count.
5.The average life span is about 3 to 4 days Leucocytes are of two types-granulocytes and agranulocytes
Granulocytes show granular cytoplasm and lobed nucles, They are of three types : neutrophills eosinophis and basophills
Neutrophills :
1. The cytoplasmic granules are stainned with neutral dyes
2.The nucleus is three to five lobed hence are called polymorphonuclear leucocytes or poly-morphs
3. They constitute microorganisms
Eodinophills (Acidophills ):
1.They show the cytoplasmic granules which are stained with acidic dyes such as eosin
2.The nucleus is bilobed
They constitute about 3% (1-6% range )of called WBCs
4. Incrase in number of eosinophills is called eosinophilla
Function:
1. Their number increases during allergic conditions
2.They show anti-histamine property
3. They are non-phagocytic
Bosophills
1. They have the cytoplasmic granules that are stained with basic dyes such as methylene blues
3. The nucleus is twisted
3. They constitute about 0.5%of total WBCs
Function
1. they relase haparin (anticoagulant ) and histamine (involved in inflammatory and allergic reaction )
2. They are non phagocytic
Agranulocytes show absence of granules in the cytopasm and nucleus is not lobed, They are of two types-Iymphocytes and monocytes
Lymphocytes:
1. They show large round nucleus
2. They constitute about 25-33% of total WBCs
3.They are two types-T and B-Lymmphocytes
Function
1. They are the largest of all WBCs and show large kidney-shaped nucleus.
2. They constitute about 3-9% of total WBCs
3 . They are also called scavengers
Function : They are phagocytic in function At the site of infection, monocytes anlarge and differentiate into macrophages which engulf micro orfanisms and remove cell debris.Hence they are also called scavengers.


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