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Granule: A term to describe a secretory vesicle

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Granules are not present in Agranolocytes

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Granulocytes have granules present in their cytoplasm

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Size: 12-15µm

Shape of nucleus: Kidney-shaped

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Size of Big Lymphocyte: 12-15 µm

Size of Small Lymphocyte: 7-8 µm

Shape of nucleus: Eccentric

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Size: 12-15 µm

Shape of Nucleus: Bi-lobed or Tri-lobed

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Size: 10-12 µm

Shape of nucleus: Bi-lobed

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Size: 10-12 µm

Shape of Nucleus: Multilobed

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Neutrophils are the one of the body's main defenses against bacteria. They kill bacteria by actually ingesting them (this is called phagocytosis). Neutrophils can phagocytize five to 20 bacteria in their lifetime. Neutrophils have a multi-lobed, segmented or polymorphonuclear nucleus and so are also called PMNs, polys or segs. Bands are immature neutrophils that are seen in the blood. When a bacterial infection is present, an increase of neutrophils and bands are seen.

Eosinophils kill parasites and have a role in allergic reactions.

Basophils are not well understood, but they function in allergic reactions. They release histamine (which causes blood vessels to leak and attracts WBCs) and heparin (which prevents clotting in the infected area so that the WBCs can reach the bacteria).

Monocytes enter the tissue, where they become larger and turn into macrophages. There they can phagocytize bacteria (up to 100 in their lifetime) throughout the body. These cells also destroy old, damaged and dead cells in the body. Macrophages are found in the liver, spleen, lungs, lymph nodes, skin and intestine. The system of macrophages scattered throughout the body is called the reticuloendothelial system. Monocytes stay in the blood for an average of 10 to 20 hours and then go into the tissues, where they become tissue macrophages and can live for months to years.

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How are White Blood Cells classified? How are they different from one another?

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How are White Blood Cells classified? How are they different from one another?

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What is another term for White Blood Cells?

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What is another term for White Blood Cells?

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Leukocytes/ Leucocytes

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members: Choonwee, Luke, Afif