Which two organs retain the ability to generate formed elements throughout adulthood?

1. Both the liver and the spleen make formed elements during fetal life. 2. Neither loses that capacity entirely once the marrow takes over. 3. Blood formation at those sites is called extramedullary hemopoiesis, meaning outside the medullary cavity of adult bone. 4. It is called into service when disease such as bone cancer destroys the marrow, which is why an enlarged spleen can accompany marrow failure. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.2 Production of the Formed Elements_