haemopoiesis


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he·mo·poi·e·sis

(hē'mō-poy-ē'sis)
The process of formation and development of the various types of blood cells and other formed elements.
Synonym(s): hematogenesis, hematopoiesis, hemogenesis, sanguification, haemopoiesis.
[hemo- + G. poiēsis, a making]

haemopoiesis

See HAEMATOPOIESIS.

haemopoiesis

see HAEMATOPOIESIS.

leucocytes

the white blood cells (WBC). All types are involved in body defences, e.g. as phagocytes or producers of antibodies. Unlike red blood cells, they are nucleated, aerobic and move freely between the blood and tissue fluids. Of a total white cell count of 5 - 10 × 103 per mm3, more than 50% are neutrophils, which increase in number with many common infections (leucocytosis). These together with the much smaller numbers of basophils and eosinophils have a multilobed nucleus and contain granules with different staining properties. About 35% of WBC are lymphocytes with a major role in immunity. Less numerous, but largest, are the circulating monocytes equivalent to macrophages in the tissues. See also blood cells, lymphatic system. See fig overleaf .

erythrocytes

the red blood cells, the main component of the microscopic 'formed elements' in the circulating blood, about 5 × 106 per mm3 (5 × 1012 per litre). Contain the pigment haemoglobin which is essential for the uptake of oxygen in the lungs and its transport to the tissues; also for exchanges with the blood plasma involved in carbon dioxide transport and in blood buffering systems. See also bone, erythropoiesis, haematocrit, leucocytes, oxyhaemoglobin dissociation curve.

erythropoiesis

the formation of red blood cells (erythrocytes) from stem cells in the bone marrow. Regulated by the hormone erythropoietin from the kidneys, where increased secretion is stimulated by reduced oxygen tension in the blood; a recombinant human form is used therapeutically to treat some types of anaemia.

haemopoiesis

formation and development of blood cells and platelets

he·mo·poi·e·sis

(hē'mō-poy-ē'sis)
Process of formation and development of various types of blood cells and other formed elements.
Synonym(s): hematopoiesis, hematosis (1) , haemopoiesis.
[hemo- + G. poiēsis, a making]
References in periodicals archive ?
HIV-infected T cells directly suppress growth of bone marrow progenitors, thus suppressing haemopoiesis.