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Defending against infection


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** White blood cells **

A white blood cell ingesting disease-causing bacteria

A white blood cell ingesting disease-causing bacteria.

White blood cells can:

· ingest pathogens and destroy them
· produce antibodies to destroy particular pathogens
· produce antitoxins that counteract the toxins released by pathogens.

In a written examination, it is easy to get carried away with metaphors
about invaders and battles: stick to the point. Note that:

· the pathogens are not the disease -


how are wbc destroyed

White blood cell - Wikipedia, the free encyclopedia


** White blood cell **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the cells of the immune system also known as white
blood cells. For the album by the band The White Stripes, see White Blood
Cells (album).

/White blood cell (WBC)/
SEM blood cells.jpgA scanning electron microscope image of normal
circulating human blood. In addition to the irregularly shaped leukocytes,
both red blood cells and many small disc-shaped platelets are visible.
MeSH /D007962/
TH H2.
FMA 62852
*/Anatomical terminology/*
[edit on Wikidata]

*White blood cells* (*WBCs*), also called *leukocytes* or *leucocytes*, are
the cells of the immune system that are involved in protecting the body
against both infectious disease and foreign invaders. All white blood cells
are produced and derived from a multipotent cell in the bone marrow known
as a hematopoietic stem cell. Leukocytes are found throughout the body,
including the blood and lymphatic system.^[1]

All white blood cells have nuclei, which distinguishes them from the other
blood cells, the anucleated red blood cells (RBCs) and platelets. Types of
white blood cells can be classified in standard ways. Two pairs of broadest
categories classify them either by structure (granulocytes or
agranulocytes) or by cell division lineage (myeloid cells or lymphoid
cells). These broadest categories can be further divided into the five main
types: neutrophils, eosinophils, basophils, lymphocytes, and monocytes.^[2]
These types are distinguished by their physical and functional
characteristics. Monocytes and neutrophils are phagocytic. Further subtypes
can be classified; for example, among lymphocytes, there are B cells, T
cells, and NK cells.

The number of leukocytes in the blood is often an indicator of disease, and
thus the *WBC count* is an important subset of


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