Blood in the Embryo
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Explanation:
By the third week of development, hematopoiesis begins in the blood islands of the yolk sac. Beginning at 1 month of age and continuing until 7 months of age, blood elements are also formed in the liver. Hematopoiesis
occurs in the spleen and lymphatic organs between 2 and 4 months, and in the bone marrow after 4 months.Tags:
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