In this article we will discuss about innate and acquired immunity. Innate Immunity: It refers to all the defence elements with which an individual is born and always available to protect the body. It is a non-specific type of defence system. (i) It is present from the time of birth and inherited from parents. (ii) It consists of four types [...]
In this article we will discuss about the primary and secondary immunodeficiencies seen in humans. Primary Immunodeficiencies: An immunodeficiency that arises from a genetic or developmental defect in the immune system is called a primary immunodeficiency. Such defects are present at birth and become manifest at different stages during development. Most defects affect either the lymphoid (giving rise to B [...]
The following points highlight the seven important cells of immune system. The cells are: 1. Hematopoietic Stem Cell 2. Lymphocytes 3. Monocytes 4. Macrophages 5. Granulocytes 6. Dendritic Cells 7. Mast Cells. Cell # 1. Hematopoietic Stem Cell: All blood cells arise from a type of cell called hematopoietic stem cell (HSC) (or stem cell). The stem cells are self-renewing, [...]