The Immune System Essay

816 Words Jun 8th, 2015 4 Pages
The immune system is known for its primary role in protecting the body from bacterial, parasitic, fungal and viral infections. It consists of organs and cells that play important and very specific roles in order to achieve adequate protection. The main components include:
Organs
• Bone Marrow Produces all the cells of the immune system through a process called hematopoiesis.
• Thymus Produces mature T cells through a process called thymic education.
• Spleen Its primary role is to filter the blood of antigens. This is done by the macrophages and dendritic cells that capture the antigens.
• Lymph Nodes Its primary role is to filter the bodily fluids of antigens, similar to the spleen, this is also done by the macrophages and dendritic cells capturing antigens.
(Linnemeyer, 2008).
Cells
• T- Cells There are two main types of the T-cell: T helper subset CD4 + T, which enhances immune responses by activating white blood cells to fight off infection and the T killer/ suppressor subset CD8 + T, which directly kills infection (viral and parasitic).
• Natural Killer Cells (NK cells) A more effective killer cell that is similar to the T-cell. Mainly functions as effector cells that are capable of directly killing certain infections (herpes and cytomegalovirus).
• B Cells Produces antibodies. When antibodies are produced a signal travels around the body informing other cells and organs to start removing the foreign substance from the body.
• Granulocytes/ Polymorphonuclear (PMN)…

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