Blood is a connective tissue composed of plasma and blood cells. It performs critical functions like transporting respiratory gases, nutrients, hormones, and protecting the body from pathogens. Blood is composed of plasma, which is 55% of blood volume, and blood cells, which include red blood cells, white blood cells, and platelets. Red blood cells are biconcave and carry oxygen, white blood cells provide immune functions, and platelets help with clotting. The document provides details on the different types of white blood cells and their roles in the immune system.

1. BIOLOGY-BLOOD
BY
S.DHANESWAR

2. BLOOD
• The blood is a fluid connective tissue.
• It is faint alkaline fluid.
• The healthy human being consist of 5 litres of blood.
A PRESENTATION BY DHANESWAR.S IX AVJC 2

3. FUNCTIONS OF BLOOD
1. Transport of respiratory gases.
2. Transport of digestive food materials.
3. Transport of nitrogenous gases.
4. Transport of hormones.
5. Protection from parasites toxins.
6. Blood coagulation.
7. Maintenance of equal temperature thought the body.
A PRESENTATION BY DHANESWAR.S IX AVJC 3

4. COMPOSITION OF BLOOD
1. Plasma.
2. Blood cells or corpuscles.
A PRESENTATION BY DHANESWAR.S IX AVJC 4

5. PLASMA
• It is the matrix of fluid connective tissue.
• The plasma forms 55% of blood.
• The organic solutes include glucose, amino acids, fatty acids, glycerol,
enzymes, hormones, antibodies and plasma proteins.
• The main plasma proteins are serum albumin, globulin and fibrinogen.
• The complete plasma is not secreted by blood cells.
A PRESENTATION BY DHANESWAR.S IX AVJC 5

6. BLOOD CELLS
• The blood cells form 45% of blood.
• The blood cells do not divide in blood. Hence the number of blood cells
does not increase.
A PRESENTATION BY DHANESWAR.S IX AVJC 6

7. TYPES OF BLOOD CELLS
1. Red blood corpuscles [R.B.C] or Erythrocytes.
2. White blood corpuscles [W.B.C] or Leucocytes.
3. Blood platelets or Thrombocytes.
A PRESENTATION BY DHANESWAR.S IX AVJC 7

8. RED BLOOD CELLS
• The red blood corpuscles are circular, biconcave disk shaped and non nuclear
cells.
• The red blood cell count can be done by a instrument called
haemocytometer.
• The R.B.C count increases during muscular exercise and at high altitudes due
to low of oxygen tension. Such abnormal increase of R.B.C is called
polycythaemia.
A PRESENTATION BY DHANESWAR.S IX AVJC 8

9. WHITE BLOOD CELLS
• It is developed from liver, spleen, lymph nodes and bone marrow.
• If W.B.C increases enormously the disease called leukaemia affect our body.
• If W.B.C number decreases, the disease called leukopenia affect our body.
• The chief function of W.B.C is protection so, they are also called as body
soldiers.
A PRESENTATION BY DHANESWAR.S IX AVJC 9

10. TYPES OF WHITE BLOOD CELLS
1. Granular leucocytes.
2. Agranular leucocytes.
A PRESENTATION BY DHANESWAR.S IX AVJC 10

11. GRANULAR LEUCOCYTES
• The granules are present in the cytoplasm.
• The nucleus is morphologically different.
• Hence leucocytes are called polymorpho nuclear leucocytes.
• The granules absorb stains.
A PRESENTATION BY DHANESWAR.S IX AVJC 11

12. TYPES OF GRANULAR LEUCOCYTES
• Eosinophils.
• Basophils.
• Neutrophils.
A PRESENTATION BY DHANESWAR.S IX AVJC 12

13. AGRANULAR LEUCOCYTES
• The granules are absent in the cytoplasm.
• The nucleus is unloaded.
A PRESENTATION BY DHANESWAR.S IX AVJC 13

14. TYPES OF AGRANULAR LECOCYTES
1. Lymphocytes.
2. Monocytes.
A PRESENTATION BY DHANESWAR.S IX AVJC 14

15. BLOOD PLATELETS
• These are found in mammalian blood.
• Blood platelets are formed by the fragmentation of megakatyotes of bone
marrow.
• They are destroyed in spleen.
• When the blood platelets are ruptured, they release a cephalic called
thromboplastin or thrombokinase.
A PRESENTATION BY DHANESWAR.S IX AVJC 15

16. THANK YOU
A PRESENTATION BY
DHANESWAR.S…