So the Cub has picked up that bone marrow produces blood cells. He asked me how the blood cells get from bone marrow into the circulation system. Are there veins that connect bones to the circulation system?
I have a vague recollection of something I read once about new blood cell (white?) formation that requires a circuitous route after (bone marrow?) initiation. If IRC, it involves an intermediate resident time in some organ (liver?) before entering the bloodstream (again?) for their final destiny. This ring a bell with anyone?
Sorry for all the parenthetics… I’m not a medical professional (and I’m half senile).