you can’t run out of blood from donating blood meaning blood is gets created, however if you don’t have the way of removing blood from donating where does all the old blood go?
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[They get recycled and expelled from the body like the cells in your body.](https://media.istockphoto.com/vectors/heme-catabolism-vector-illustration-labeled-chemical-blood-reaction-vector-id1197051922?k=20&m=1197051922&s=612×612&w=0&h=iNLol6Pv-PMb-RgbZWhA-8NU0El_gVoL59OmsXUoo_M=) Red blood cells in particular are broken down by the liver and kidneys.
A human blood cell survives in circulation for about 115 days. After it dies the remains of the dead cells get excreted as waste, finding their way into both your urine and poo.
The body also constantly monitors how much blood you have so if you are low on blood (such as by donating or bleeding) then your body will temporarily increase the production of blood to catch up and restore you to normal.
Old blood cells usually return to the spleen to be decommissioned (destroyed) while your bone marrow produces new ones.
This cycle is in place to ensure you have functioning red cells at all times, that are capable of absorbing oxygen.
A red blood cell has a limited lifespan before it becomes ineffective.
I don’t know the exact time but I was always told that no single blood cell is older than a month at any given time (this may or may not be true).
Oh, and you can definitely run out of blood from donating blood.
There is a reason there is a limit of both amount and frequency you can give blood of.
There is a minimum amount of blood your body needs to survive. There is almost of maximum rate at which your body can produce new blood. Get blood out faster than that for long enough and you’re gonna have a bad time.
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