MEASUREMENT OF RENAL BLOOD FLOW
Q. 1
How much of blood flows through the kidneys?
A 
11.5 L/min 

B 
1.52 L/min 

C 
22.5L/min 

D 
2.53 L/min 
Q. 1
How much of blood flows through the kidneys?
A 
11.5 L/min 

B 
1.52 L/min 

C 
22.5L/min 

D 
2.53 L/min 
Ans.
A
Explanation:
11.5 L/min.
 The total renal blood flow (RBF) is approximately 1.11.3 Lit/min.
 i.e.,2225% of cardiac output.
Q. 2
Two substances that can probably be used to determine filtration fraction are
A 
Insulin and mannitol 

B 
Urea & diodrast 

C 
PAH and phenol red 

D 
Inulin and PAH 
Q. 2
Two substances that can probably be used to determine filtration fraction are
A 
Insulin and mannitol 

B 
Urea & diodrast 

C 
PAH and phenol red 

D 
Inulin and PAH 
Ans.
D
Explanation:
Inulin and PAH.
 Filtration fraction – GFR/renal plasma flow.
 Again, GFR is measured by inulin and renal plasma flow is measured by PAH.
Q. 3
In humans, effective renal blood flow is
A 
425 

B 
525 

C 
625 

D 
725 
Q. 3
In humans, effective renal blood flow is
A 
425 

B 
525 

C 
625 

D 
725 
Ans.
C
Explanation:
625
Measure of Effective Renal Plasma Flow (ERPF):
 Is through PAH clearance
 In normal adult is about 625 ml/minute
 However, PAH underestimates the effective renal plasma flow by about 10%.
 Therefore, actual renal plasma flow is about 700 ml/min.