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Ive been trying to understand mechanisms of blood pressure and so far the more I read the more confusing it gets. What I really dont understand is this - why does the pressure drop is largest in arterioles? The physiology book I use says that they constitute a high resistance and as the total blood flow is constant at all levels of the cardiovascular system the pressure is suppose to drop and this equation is given Q = ΔP/R, or ΔP = Q × R. I just dont get it, if the R is to increase then to sustain the same Q the pressure should actually increase from the equation. I always imagined that as larger blood vessels branch the total crossection area increases and so the total resistance decreases and thats the reason for pressure drop. Im really confused with this. :(

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# Blood pressure drop

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