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How does the human body create blood, how does it know when to stop (not keep producing while causing problems), how does it know when to begin again? (Questions are structured with assumption it stops and starts -no real knowledge, just very curious question)

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How does the human body create blood, how does it know when to stop (not keep producing while causing problems), how does it know when to begin again? (Questions are structured with assumption it stops and starts -no real knowledge, just very curious question)	1