Description
AngiotensinII(ATII)isapeptideproducedfromATIbyangiotensin-converting-enzyme(ACE).ATIIbindstheATIItype1(AT1)receptor,stimulatingGPCRsinvascularsmoothmusclecellsandincreasingintracellularCa2+levels;thisresultsincontractionandvasoconstriction,increasingbloodpressure.ATIIalsoactsattheNa+/H+exchangerintheproximaltubulesofthekidney.Here,ATIIincreasesreabsorptionofNa+andHCO3-andexcretionofH+,increasingbloodvolumeandpHandfurtherincreasingbloodpressure.