chadox1 covid vaccine | immune system | akgen | malayalam
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Immune system
The immune system is a network of cells and proteins that defends the body against infection. The immune system keeps a record of every germ, it has ever defeated so it can recognise and destroy the microbe quickly if it enters the body again.
The main parts of the immune system are:
white blood cells
antibodies
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White blood cells
White blood cells are the key players in your immune system. They are made in your bone marrow and are part of the lymphatic system White blood cells include lymphocytes (such as B-cells, T-cells and natural killer cells), and many other types of immune cells.
B cells
B cells, also known as B lymphocytes, are a type of white blood cell of the lymphocyte subtype. They function in the humoral immunity component of the adaptive immune system by secreting antibodies.
T cell
A T cell is a type of lymphocyte, which develops in the thymus gland and plays a central role in the immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor on the cell surface.
Dendritic cells
Dendritic cells are antigen-presenting cells of the mammalian immune system. Their main function is to process antigen material and present it on the cell surface to the T cells of the immune system. They act as messengers between the innate and the adaptive immune system.
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