if a person loose his hand in an accident do the blood flows through his body is equal to the volume of blood before accident? how human body manage with that blood which is deserved by the missed body part? if human body have such a mechanism. does it effect other body parts? or is there any change in the proportion of blood flows through different arteries?
The kidney regulates the amount of blood being produced and removed from/recycled in the body. Even if somehow the body lost no blood when it lost the limb, the kidneys would remove the excess blood as it filters.
I think the misconception in asking this question is that the body knows how much blood to produce for the body. Yet, that isn’t the case, it just regulates the amount based on different signals it gets from the blood.