List all hematopoietic organs. How is hematopoiesis regulated? Where are spent blood cells destroyed?

Red bone marrow, spleen, lymph nodes, lymphoid tissue of the intestines and tonsils. The process of hematopoiesis is regulated by the hypothalamus, as well as by erythropoietins, leukopoietins and thrombopoietins, substances produced in the kidneys; vitamins C, B6, folic acid stimulate hematopoiesis. Blood cells in the liver and spleen are destroyed.

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