Q:

Renal blood flow falls

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Renal blood flow falls.


  1. About 10 per cent when arterial pressure falls 10 per cent below normal.
  2. About 5 per cent when metabolic activity in the kidney falls by 5 per cent.
  3. During emotional stress.
  4. After moderate haemorrhage.
  5. Gradually from the inner medulla to the outer cortex per unit weight of tissue.

All Answers

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 A. False Due to autoregulation, flow changes little with small changes in perfusion pres-sure.

B. False Normal renal blood flow is vastly in excess of its metabolic requirements.

C. True Due to sympathetic vasoconstrictor nerves and circulating catecholamines.

D. True A reflex response to the fall in blood pressure so caused.

E. False Cortical flow is 10–20 times higher than medullary flow.

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