how is blood produced?
I must have been asleep during biology class because I don't recall ever learning this. The circulatory system seems like a closed loop. How does new blood get in? You hear about people bleeding to death but I've never heard that a person lost his/her ability to produce blood. There are blood quality and flow disorders. Are there blood volume disorders?
Thanks,
Sixto
95 S420
87 300SDL
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