primary lymphoid organ

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• Organ (anatomy) — For the musical instrument, see Organ (music). In biology, an organ (Latin: organum, instrument, tool , from Greek ὄργανον, organon, organ, instrument, tool [1]) is a collection of tissues joined in structural unit to serve a common function. [2] …   Wikipedia

• Mucosa-associated lymphoid tissue — MALT redirects here. For germinated cereal grains, see Malt. The mucosa associated lymphoid tissue (MALT) (also called mucosa associated lymphatic tissue) is the diffusion system of small concentrations of lymphoid tissue found in various sites… …   Wikipedia

• Sex organ — Flowers are the sex organs of flowering plants. A sex organ, or primary sexual characteristic, as narrowly defined, is any of the anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a… …   Wikipedia

• Thymus — An organ in which lymphocytes mature and multiply. It lies behind the breastbone. * * * [NA] A primary lymphoid organ, located in the superior mediastinum and lower part of the neck, that is necessary in early life for the normal development of… …   Medical dictionary

• MHC restriction — MHC restricted antigen recognition, or MHC restriction, refers to the fact that a given T cell will recognize a peptide antigen only when it is bound to a particular MHC molecule. Normally, as T cells are stimulated only in the presence of self… …   Wikipedia

• bursa of Fabricius — (běr sě fě bris e ěs) Found in birds; the blind saclike structure located on the posterior wall of the cloaca; it performs a thymuslike function. A primary lymphoid organ where B cell maturation occurs. Bone marrow is the equivalent in mammals …   Dictionary of microbiology

• thymus — (thi měs) A primary lymphoid organ in the chest that is necessary in early life for the development of immunological functions. T cell maturation takes place here …   Dictionary of microbiology

• lymphatic system — Anat., Zool. the system by which lymph is returned from the cells to the blood and by which white blood cells are produced in response to inflammation or presence of antigens; in mammals, the system includes the lymph glands, vessels and sinuses… …   Universalium

• immune system — Anat. a diffuse, complex network of interacting cells, cell products, and cell forming tissues that protects the body from pathogens and other foreign substances, destroys infected and malignant cells, and removes cellular debris: the system… …   Universalium

• Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …   Wikipedia

• human disease — Introduction       an impairment of the normal state of a human being that interrupts or modifies its vital functions. health versus disease       Before human disease can be discussed, the meanings of the terms health, physical fitness, illness …   Universalium