Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white bloodcells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.
  1. Blood cells also know as formet elements is 45%.
  2. Plasma also know as fluid matris is 55%.

Packed Cell volume (PCV) Hemotorit value 

In this process blood is taken in a tube and anticogulant is added and centrifuge for 30min the result is that fegunay plasma on tap which is 55% and blood cells settels down on the bottom and is about 45%.
 Blood    
  1. Blood cell
  2. Plasma
 Blood - It consist of RBC which also called (erytherecyte) WBC is called to and which is also called combcocyts .
Plasma - It is straw coloured clear 91% to 92% water and 8% to 9% organic and inorganic solids like glacier creative plasma protein colestral, iran, calcium, sodium, potassium, magnesium, hycmhonate, copper etc. 

Serum =  Plasma-Fibrinogen 

When clotting take place fibrinogen convert in fibren which trops the blood cells serum oozes out. 

Function of blood

  1. Nutritive function- Glucose, aminoacid, lipids, vitamins from digestive blood absarved by gesto intestinal trop (GIT) is supplied to verious parts of the body. 
  2. Respratary fuction- Oxigen is provided from alved to diffent tissus in the body and earhondioxide from the verious part of the body cames to the alvedi and it is expire out (Breath out) .
  3. Exteabry function- Waste production from liver, kidney lecngs is excreted out.
  4. Transform of harmoner and enzymes to organs.
  5. Regulation of mater balance .
  6. Regulation of acid and basic balenes it is also know as buffring 
  7. Body tampeature regulation also know as thesma regulation.
  8. Defension function (WBC)- WBC provides immunity which help to defensec.
  9. Storeg function- Glucose sodium potassium protein are always prevent in blood to be observed in the emergency or starvation fluid loos etc.