Measurement Of Renal Blood Flow

MEASUREMENT OF RENAL BLOOD FLOW

Q. 1

How much of blood flows through the kidneys?

 A

1-1.5 L/min

 B

1.5-2 L/min

 C

2-2.5L/min

 D

2.5-3 L/min

Q. 1

How much of blood flows through the kidneys?

 A

1-1.5 L/min

 B

1.5-2 L/min

 C

2-2.5L/min

 D

2.5-3 L/min

Ans. A

Explanation:

1-1.5 L/min.

  • The total renal blood flow (RBF) is approximately 1.1-1.3 Lit/min.
  • i.e.,22-25% 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.


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