How do red blood cells enter the circulatory system

[scilearner]

Hello everyone,

 

I just started biology and I have lots of clarifications If red blood cells are created in the bone marrow how do they enter the circulatory system. Do they permeate through the blood vessels?

[Mokele]

Bones are actually quite well-vascularized, mostly to allow release and re-deposition of calcium, but this also applies to the marrow.

[GDG]

Wikipedia has a pretty good illustration of bone structure.