Regulation of Extracellular Volume and Blood Pressure

Regulation of Extracellular Volume

and Blood Pressure

Vra Cert?kov? Ch?bov? Department of Nephrology, 1st Medical Faculty, Charles University

BP = heart output x resistance Blood pressure

Water balance Input/output

Input/output Salt balance

Osmolality Osmolality = total osmoles/volume

Extracellular fluid volume regulation

OVLT ? organum vasculosum laminae terminalis SFO ? subfornical organ PVN ? periventricular nucleus SON ? supraoptic nucleus

Osmolality regulation

setpoint

Short term baroreceptor reflex

Long term water /salt output

Intermediate term RAS

BP regulation

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