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Diameter of Afferent Blood Vessel & Glomerular Filtration Rate

(arrows mean increase or decrease)

Circle

Circle

Large diameter

high volume

high net pressure

fast GFR (rate)

so

there is no time to reabsorb

high solute concentration

high osmotic pressure

at the juxtaglomerular apparatus

so vasoconstrictor will be released

Small diameter

low volume

low net pressure

slow GFR (rate)

so

there is too much time to reabsorb

low solute concentration

low osmotic pressure

at the juxtaglomerular apparatus

so vasodilator will be released

circle from Microsoft Front Page