Haematopoiesis

Haematopoiesis (/hɪˌmætəpɔɪˈiːsɪs, ˌhiːmətoʊ-, ˌhɛmə-/;^[1][2] from Ancient Greek αἷμα (haîma) 'blood' and ποιεῖν (poieîn) 'to make'; also hematopoiesis in American English, sometimes h(a)emopoiesis) is the formation of blood cellular components. All cellular blood components are derived from haematopoietic stem cells.^[3] In a healthy adult human, roughly ten billion (10¹⁰) to a hundred billion (10¹¹) new blood cells are produced per day, in order to maintain steady state levels in the peripheral circulation.^{[4][5][page needed]}