QS Study

Individual function of White Blood Cells (WBC)

White blood cells are a vital element of our immune system. They help our body fight antigens, which are bacteria, viruses, and other toxins that make you sick. When our body is in suffering and an exacting part is under attack, white blood cells rush in to help demolish the damaging essence and avert illness.

There are different kinds of white blood cells, and each has a different job. Some fight bacteria, others fight allergies, and others battle parasites.

Fig: types of White Blood Cells

Neutrophil – They are the most numerous type of white blood cell and your first line of defense when infection strikes. They are the first line of defense against invading antigens and are first to arrive at the site of infection or injury.

  • Phagocytosis of microorganism.
  • Anti-inflammatory action.

Eosinophil- They attack and kill parasites, destroy cancer cells, and help with allergic responses. It develops in the bone marrow before migrating out into the bloodstream.

  • Anti-inflammatory effect
  • Anti-allergic action.
  • Attacks – certain worn and parasites.

Basophil- They secrete chemicals such as histamine, a marker of allergic disease, that help control the body’s immune response.

  • Release histamine – It is allergic and inflammatory
  • Release heparin – which acts as an anticoagulant.

Lymphocyte- They create antibodies to defend against bacteria, viruses, and other potentially harmful invaders.

  • Help in the formation of Ab. (Humeral immunity)
  • Take part in the immune reaction.
  • Helps in the repair of tissue by convening fibroblast.
  • Produce trephone from plasma protein.

Monocyte- They attack and kill parasites, destroy cancer cells, and help with allergic responses. It originates in the bone marrow and develops into large macrophages in the bloodstream.

  • Phagocytosis of tumor, bacteria, virus, and parasite.
  • Form R. E. system.

Other Functions of WBC

(i) Phagocytosis:- By this process WBC especially neutrophil and macrophage engulf foreign particles and microorganisms.

(ii) Humoral immunity: B Lymphocyte produces antibody and plays an important role in the defensive mechanism of the body.

(iii) Prevention of clotting: Basophil secretes heparin which prevents intravascular clotting.

(iv) Repair of tissue: Lymphocyte may be converted into fibroblasts in the area of infection and thus help the process of repair.

(v) 5HT- Eosinophil produces 5HT which act as Anti-histamine.

(vi) Act as scavenger: As a scavenger they remove debris from dead tissue.