whitebloodcells
Post on 07-Aug-2015
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White Blood Cells
• Are spherical cells that lack hemoglobin
• Form a thin, white layer of cells between plasma and red blood cells when the components of blood are separated from each other
Two functions of white blood cells
1. To protect the body against invading microorganisms
2. To remove dead cells and debris from the tissues by phagocytosis
A. Granulocytes- those containing large cytoplasmic granules
1. Neutrophil2. Basophil3. Eosinophil
B. Agranulocytes- those with very small granules that cannot be seen easily with the light microscope
1. Lymphocyte2. Monocyte
White blood cells are classified into two groups:
Neutrophils• The most common type
of white blood cells• Usually remain the blood
for a short time (10-12 hours)
• Move into other tissues, phagocytize microorganisms and other foreign substances
Basophils• Least common of all
white blood cells• Release histamine and
other chemicals that promote inflammation
• Also release heparin, which prevents the formation of clots
Eosinophils
• Involved in inflammatory responses associated with allergies and asthma
• Also involved in destroying certain worm parasites
Lymphocytes• Are the smallest of the
white blood cells• Their diverse activities
include the following:• Production of antibodies and
other chemicals that destroy microorganisms, contribute to allergic reactions, reject grafts, control tumors, and regulate the immune system.
Monocytes
• Are the largest of the white blood cells
• After they leave the blood and enter tissues, they enlarge and become macrophages, which phagocytize bacteria, dead cells, cell fragments, and any other debris within the tissues.
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