I keep reading, as a science student, that when blood flow or pressure goes down, arterioles constrict in order to raise blood pressure. But vasoconstriction actually increases resistance, thereby depriving the tissue further of blood flow.
So what is it that I’m not understanding?
In: Biology
Yes it raises resistance. But why? When the vessels constrict their internal volume decreases. It takes less blood to fill up all the vessels. Someone might be hypovolemic and their body vasoconstricting helps compensate for the lower blood volume.
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