Blood pressure regulation

[549]

Hi,

So here's what I know: If blood pressure is low, then angiotensin 2 can cause systemic vasoconstriction which will lead to an increase in the blood pressure. In addition, low urine osmolarity can cause afferent arteriole dilation and lead to increased BP in the glomerulus.

Can anyone please explain how both vasoconstriction of systemic blood vessels and dilation of the afferent arteriole to lead to increased BP?

Thanks!

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[Rabolisk]

The first is systemic vasoconstriction leafing to increased systemic BP upstream in the aorta and the arteries. This is the measured systolic/diastolic BP. Dilation of the arteriole leading to the kidney results in increased hydrostatic pressure at the glomerulus and more filtration due to increased blood volume flow to that area.