One: The body isn’t just a sack full of a blood. It’s a closed system where you only seriously bleed if you severe a major artery. Surgeons are trained not to cut arteries unless necessary.
Two: A lot of surgeries begin with a local injection of epinephrine, which constricts local blood vessels. This means that the local area doesn’t bleed much because the vessels are not flowing fully.
Three: If the surgery requires a blood transfusion, the transfusion will include the clotting factors that lead to clot formation. This means that your blood is primed to stop bleeding.
I work in hospitals and the operating rooms.
Surgeons are adept at minimizing blood loss through speed and efficiency. There are also many tools, such as tourniquets for limbs and cauterization tools (which seal cut vessels) to minimize blood loss. Additionally surgeons know where to cut to avoid vessels that will cause significant bleeding.
I’ve seen joint replacements where the patient loses less than 250 mL / 8 oz of blood. This is well within the body’s ability to replenish without undue stress.
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