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NBME 21 Answers

nbme21/Block 2/Question#25 (21.6 difficulty score)
A 54-year-old man comes to the physician for ...
Area labeled 'F' (Efferent arteriole)πŸ”,πŸ“Ί

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submitted by hungrybox(1044),
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tvnaeRel miagrda

TAII rsicsocntt eht reetenff iaere.orlt ACE btinhoriis clbok eht tCediAEm-dea cnisoneovr of TAI ot .IITA

submitted by neolidone(1),
  • ACEI prevent the conversion from Angiotensin I to Angiotensin II. It leads to a dilation of the efferent artery which is constricted under ATII's effect.

  • The point of this question is to realize which structure is the efferent artery. In the picture, the label C is Juxtaglomerula cells, the adherent part of the label E is Macula densa of DCT. Those structures are in close contact with the afferent artery to sense sodium and perfusion pressure, so the F is the efferent artery.

kevin  Just look at the arrows; the last one will be efferent since it flows from afferent to efferent +2  

submitted by an_improved_me(16),

Since AgII also affects the proximal tubular Na+/H+ antiport, would (A) also be a correct answer if it didn't say "most effected"?