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Hematopoietic stem cells :

cells which are at the origin of all types of blood cells (red cells, white cells, platelets).

Hematosis :

transformation of venous blood rich in carbon dioxide in pulmonary alveoli, into arterial blood rich in oxygen.

Heredity :

transmission of genetic characters from one generation to another.

Histocompatibility :

compatibility between two organs or tissues so that a graft (of an organ or of cells) is not rejected. This compatibility depends on the genetic similarities between donor and recipient.

Histology :

microscopic examination of tissues


Human Leukocyte Antigens, nomenclature designating MHC in humans.

HLA typing (Human Leukocyte Antigen) :

assay of certain molecules present on white blood cells histocompatibility antigens. Depending on their mutual combination, these antigens mark the particular character of an individual and play an essential role in its defence.

Hypertrophy :

increase in the volume or size of an organ.

Hypoglycemia :

low levels of glucose in blood.

Hypotonia :

decreased muscle tone ("limpness").