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Composition of Blood

Hii Friends, Today we are going to discuss about Composition of Blood.

Blood – Blood is a main circulating fuild in the human body. Study of blood is called Hematology. The system in which blood is circulated throughout the body is called circulating system.

Blood

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  • The main circulating, bright red, slightly alkaline fuild in the human body .
  • Study of blood is called haematology.
  • Blood is a fuild connective tissue derived from mesoderm. It has pH about 7.4.
  • There are about 5 litters of blood in the body which is about 8 %of the total body weight.

Composition of blood

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There are two main components of blood, viz.,

  • Plasma (55%)
  • Blood corpuscles (45%)

Plasma

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  • Plasma is a straw coloured fuild part of blood, slightly alkaline, viscous fuild consisting of 90 – 92 % water and 8-10% of solutes.
  • Solutes are 7% proteins (serum,albumin,serum globulin, heparin, fibrinogen and prothrombin).
  • Other solutes are nutrients (glucose, amino acids, fatty acids and glycerol.)
  • Nitrogenous wastes such as urea, uric acid, ammonia and creatinine.
  • Gases like oxygen, carbon dioxide and nitrogen.
  • Regulatory substance like enzymes and hormones.
  • Inorganic substances like bicarbonates ,chlorides, phosphates and sulphates of sodium potassium, calcium, magnesium, etc.

Blood corpuscles

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Blood corpuscles are solid part of blood. They are of three types, viz. Erythrocytes (RBCs), leucocytes (WBCs) and thrombocytes (platalets) .

Erythrocytes or RBCs

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  • Circular, bioconcave, enclueated cells of about 7micrometer in diameter and 2.5micrometer in thickness.
  • RBC count is about 5.1 to 5.8 million RBCs in male and 4.3 to 5.2 million in females. The average life span of RBC is about 120 days.
  • Erythropoiesis is formation of RBCs. It occurs in liver and spleen in foetus and in red bone marrow in adults.
  • The old RBCs are destroyed in liver and spleen.
  • Polycythemia is increase while erythrocytopenia is decreases in number of RBCs.
  • RBCs contain respiratory pigment called haemoglobin which helps in transport of oxygen and carbon dioxide.
  • The normal haemoglobin content in adult male is 13-18 mg/100 ml of blood and 11.5-16.5mg/100 ml of blood in adult female.
  • Less amount of haemoglobin leads to anaemia.

Leucocytes or WBCs

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  • Leucocytes are colourless, nucleated, amoeboid and phagocytic cells.
  • They show diapedesis, I.e. squeezing out of blood capillaries by amoeboid movement.
  • The size is about 8 to 15 umicrometer.
  • Total WBC count is 5000 to 9000 WBCs /cu my of blood.
  • The average life span of WBCs is about 3 to 4 days.
  • Leucopoiesis or formation of WBCs. It occurs in red bone marrow, spleen, lymph nodes, tonsil thymus and payers patches.
  • Leukemia or blood cancer is a pathological increase in no of WBCs.
  • Leucocytes are of two types, viz., granulocytes and agranulocyctes.

Thrombocytes or platalets

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  • Thrombocytes are smallest, nonnucleated, round and biconvex. They are of about 2.5 to 5 micro m in diameter.
  • Their life span is about 5 to 10 days.
  • Megakaryocytes of bone marrow from thrombocytes.
  • Thrombopoiesis is the formation of platelets.
  • Thrombocytosis is the increase while thrombocytopenia is the decrease in platalets count.
  • Thrombocytes help in coagulation of blood by releasing thromboplastine.

So guys, I hope you have understood the concept of composition of blood through this information. Share this information friends and family.

Thank you..!

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