Defination of Haematology, Blood and its composition.

 

Haematology :-

·       The word” Haematology” is the ‘Study of BLOOD’.

     Haematological Laboratories is concerned with the abnormalities of the constituents of blood, namely the Plasma and the Blood cells.  

    

Haematology / Study of Blood.

 Click here to watch:-   What is Haemoglobin.

 Click here to watch:-   Synthesis, Degradation, Forms of Hb.

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       Defination & functions of Blood:-  

 

·       The red liquid that circulates in the arteries and veins. Blood absorb oxygen in the lungs, nutrients in thegastro-intestinal system and the supplies the tissues with these essential substances. The blood also collects the harmful wastes produced as end products of metabolism and transport them to the organs of excretion.

Composition of blood:-

An average healthy adult has blood equivalent to 7-8% of the body weight.  Blood is mainly composed  of Plasma, a fluid In which White blood cells(WBC), Red blood cells(RBC) and and the platelets (thrombocytes).

Plasma:-   

Plasma occupying 55% of the total volume of blood contains  90% of water, the remaining 10% of being  proteins, carbohydrates lipids, harmones, enzymes,  vitamins and salts.

Erythrocytes:-  

The majority of cells suspended in  plasma are  erythrocytes. The erythrocytes contain a  high concentration of haemoglobin a red coloured pigment which acts as the oxygen carrier.

 

 Leucocytes :-   

The leucocytes are much less in  number than the  erythrocytes.
 

Platelets :-  

The platelets are associated with blood coagulation                                                mechanism.