Renal Blood Flow

Question 1

Pathway of blood flow

Answer 1

Renal-segmental-interlobar-arcuate- interlobar- afferent- glomerular capillaries- efferent- vasa recta

Question 2

Oxygen consumption mL per min

Answer 2

Kidney- 18
Liver- 52
Brain- 45
Skeletal muscle- 50
Heart- 30

Question 3

Renal blood flow

Answer 3

RBF= RPF * 1/(1-Hct)

Question 4

Effective renal plasma flow

Answer 4

625 mL/min, measured by using PAH
Actual RPF: 689 mL/min
Therefore RBF: 1300 mL/min
Hct: 0.47

Question 5

Regulation of RBF

Answer 5

Neural- symp decreases, cold, exercise, pain, anesthesia. RAAS
Hormonal- catecholamines, angiotensin II decrease, dopamine in high conc increase

Local factors- CO2, prostaglandins vasodilation, adenosine, constrictor
Autoregulation