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Glossary of Terms N through Z.

N:C ratio - Nuclear: cytoplasmic ratio - The ratio of nuclear volume to cytoplasmic volume within any one cell.

Neoplasm - Any new and abnormal growth, such as a tumor.

Neutrophilic granules - Specific granules present in the cytoplasm of neutrophils. These granules resemble pencil stippling and stain a lilac color due to their affinity for both basic and acid dyes.

Phagocyte - Any cell that ingests microorganisms, other cells, or foreign particles.

Phagocytosis - The ingestion and destruction of microorganisms or other foreign particles.

Plasma - The fluid portion of blood in which the various blood cells are suspended.

PF3 (platelet factor 3) - A lipoprotein component of the platelet membrane; functions as a surface catalyst during blood coagulation.

Pseudopod - A temporary protrusion of the cytoplasm of a cell.

Refractile - Capable of refracting or changing the direction of light.

Senescence - The process or condition of growing old.

Serotonin - A constituent of blood platelets and other cells and organs; induces constriction of the blood vessels.

Specific Granules - Granules found in cells of the more mature stages of the granulocytic series. They have distinct staining reactions which differ with each type of granulocyte.

T-cell - Thymus derived lymphocyte which mediates cellular immunity.

Thrombocyte (Platelet) - A circular or oval disk found in the blood; concerned with hemostasis.

Thymus - A ductless gland-like body situated in the anterior mediastinal cavity; reaches its maximum development during the early years of childhood.

Vacuole - Any small space or cavity formed in the cytoplasm of a cell.