All cellular components of the blood came from hematopoietic stem cells (HSCs) located in the marrow. The HSCs have the ability to give rise to all of the different mature blood cell types, such as erythrocytes, T cells, B cells, granulocytes, megakaryocytes, macrophages.
Word origin: from Ancient Greek: haima, blood + poiesis, to make.
Related forms: hematopoietic (adjective).
See also: granulopoiesis.