22. Long answer question III

Why are leucocytes classified as granulocytes and agranulocytes? Name each cell and mention its functions.

 

a. White blood cells are colourless due to the lack of . They are nucleated and relatively lesser in number.

 

b. The leucocytes are of  types.

 

c.  contain small granules in their cytoplasm. There are  types of granulocytes.

 

d. are large and have a \(2 - 7\) lobed nucleus. They form \(60 - 65 \%\) of the total leucocytes. They are phagocytic, and their numbers increase during infection and inflammation.

 

e.  have a bilobed nucleus and comprise about \(2 - 3 \%\) of the total leucocytes.

 

f. have a lobed nucleus and comprise about \(0.5 - 1 \%\) of the total leucocytes. They release chemicals like  histamine, heparin and serotonin during inflammation which are involved in the inflammatory reactions. 

 

g.  do not contain granules in the cytoplasm. There are two types.

 

h.  constitute about \(20 - 25 \%\) of the total leucocytes. They produce antibodies during viral and bacterial infections. There are \(two\) major types of lymphocytes that include B and T lymphocytes. These are responsible for the body's immune responses.

 

i.  are amoeboid in shape and are the largest of all the lymphocytes. They constitute about \(5 - 6 \%\) of the total leucocytes, and are phagocytic and can engulf bacteria.