Leucocyte
Leucocyte
Leucocytes (pronounced: loo-ko-sites), also known as white blood cells (WBCs), are a crucial part of the immune system that helps the body fight off infections and diseases. The term "leucocyte" is derived from the Greek words "leukos" meaning "white" and "kytos" meaning "cell".
Types of Leucocytes
There are five main types of leucocytes, each with its own specific function in the immune response. These include:
- Neutrophils: These are the most common type of leucocyte and are the first to respond to an infection.
- Lymphocytes: These cells are responsible for the body's immune response and consist of B cells, T cells, and natural killer cells.
- Monocytes: These cells become macrophages when they enter tissue and help to remove dead cell debris.
- Eosinophils: These cells are involved in the response to parasitic infections and allergic reactions.
- Basophils: These cells release histamine during allergic reactions.
Function
Leucocytes are produced in the bone marrow and are then released into the bloodstream. They move towards areas of infection or inflammation in the body, where they work to destroy the invading pathogens. This is achieved through a process known as phagocytosis, where the leucocyte engulfs and digests the pathogen.
Related Terms
- Leukemia: A type of cancer that affects the leucocytes and the bone marrow.
- Leukocytosis: A condition characterized by an increased number of leucocytes in the blood.
- Leukopenia: A condition characterized by a decreased number of leucocytes in the blood.
- Leukocyte adhesion deficiency: A rare, inherited disorder that affects the immune system.
External links
- Medical encyclopedia article on Leucocyte
- Wikipedia's article - Leucocyte
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