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Blood is a fluid connective tissues.blood has generally 3 componenets:-
1.RBC(red blood cells)
2.WBC(white blood cells)
rbcs are the most abundant of all the cells in the blood and help in maintaining the red blood cells.the formation of rbc is known as erythropoises.
wbcs acts as defence mechanism of the body.
platelets play an important role in the clotting of the blood.

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Blood is a red color fluid which flows around the body the circulatory systems,
it contain, RBC,WBC,platelets,
RBC- red blood cells transfer oxygen 
WBC-white blood cells are antibodies to defend from foreign harmfull particles
Platelets- covers the cut or worn area of any part of the body