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NBME 20 Answers

nbme20/Block 4/Question#47 (30.1 difficulty score)
A 61-year-old man has erectile dysfunction ...
Area labeled β€˜D’ (Corpus cavernosum)πŸ”,πŸ“Ί
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 +4 
submitted by neovanilla(47),
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A = aMbye het ecrspfaliui ladros einv

B = loraAre ssuite

C = rtarheU ruusdeodr(n by crpsou uign)mosspo

D = pouCsr covrsaunem cr(rocte wsaner)

lfiSnliaed sciseerna obold lofw ot eth espni by galinitd the puscro asnveormcu ncesaired( ON via inbtiohiin of P5ED -;tg-& McPG t-g&-; thmsoo emucsl ixaatr.neol) It tondes' atuallcy tefafc eht bodlo lsesesv sippyugnl hte spruoc emoacs,ruvn I ieelevb

mangotango  This pathway causes relaxation of vascular smooth muscle so it causes vasodilation and increased blood flow to the corpus cavernosum, causing an erection. +  



 +2 
submitted by xxabi(267),
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-EPD5 nbrstiihio g(..e ld,leiiafns )aaadltlif ear dieiadntc rfo DE yb ywa fo nsegricain odlbo lwfo ni the prsuco cvsnorumae ebedl(la D) of teh iespn

dulxy071  I believe technically the answer would not be (B) as the corpus cavernosum isn't ACTED ON by PDE inhibitors ( per the words used in the question ) but rather simply fills as a result of PDE inhibitors acting on the internal pudis artery among many others to allow more blood flow into the corpus cavernosum for an erection +4