Multiple choice

Which of the following statements concerning renal blood flow are true?

  1. The efferent arterioles deliver blood to the glomerulus.

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

  3. Vasoconstriction of the afferent arterioles increases glomerular filtration.

  4. Vasoconstriction of the efferent arterioles decreases glomerular filtration.

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

For nephrons which are in the outer cortex and do not have vasa recta or long loops of Henle, the efferent arterioles supply the peritubular capillaries. Flow occurs when the pressure at one end of a tube is made greater than that at the other end.

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