Multiple choice

Which of the following statements characterises the renal blood flow in humans?

  1. The efferent arterioles deliver blood to the glomerulus.

  2. Vasa recta receive their blood supply from the afferent arterioles.

  3. Vasoconstriction of afferent arterioles increases glomerular filtration.

  4. Vasoconstriction of the efferent arterioles increases glomerular filtration.

  5. Vasoconstriction reduces the resistance to flow in a blood vessel.
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D Correct answer
Explanation

If there is vasoconstriction of the efferent arteriole, the pressure upstream the constriction in the glomerulus is increased and so more filtration occurs.

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