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Hemopoiesis

Adult produces 400 billion platelets, 200 billion RBCs and 10 billion WBCs every day

Hemopoietic tissues produce blood cells

yolk sac produces stem cells

colonize fetal bone marrow, liver, spleen and thymus

liver stops producing blood cells at birth

spleen remains involved with WBC production

lymphoid hemopoiesis occurs in widely distributed lymphoid tissues (thymus, tonsils, lymph nodes, spleen and peyers patches in intestines)

red bone marrow

pluripotent stem cells

myeloid hemopoiesis produces RBCs, WBCs and platelets

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