system
Given the following post, respond as if you're commenting on Reddit:
human
Why can't you simply take blood out to ease high blood pressure?

~~Since the circulatory system is a closed circuit,~~ Edit:*The circulatory system is not a closed system*  why is it that when people have high blood pressure crisis doctors don't just simply take out some blood in order to quickly reduce the pressure?  When someone is injured and their pressure is dropping the usual procedure is to administer IV fluids to the patient, wouldn't the opposite be effective to lower pressure?

Also, if it were possible to have a pump attached to a major vein to draw and store blood in a reservoir outside the body will this also be an efficient method to control blood (pressure in people with HBP)?
gpt
Biological cardiovascular pressure is more complicated than simple fluid dynamics unfortunately.  Basically it is the contraction of the vessels themselves that results in the increased pressure and not anything to do with fluid volume.