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NBME 19 Answers

nbme19/Block 4/Question#46 (reveal difficulty score)
24 yo woman; renal oxygen consumption found ...
Tubular reabsorption 🔍 / 📺 / 🌳

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submitted by strugglebus(177),
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submitted by cassdawg(1533),
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waitingonprometric  I believe this is correct--assuming that active transport of solutes at the thick ascending limb and active transport of solutes (secondary to Na/K pump) at the PCT consumes O2 at highest rate b/c of ATP use. Since tubular reabsorption always happening...very high use of O2 relative to the other answer choices that occur sporadically in response to body homeostatic changes? Note: glomerular filtration is always happening, but that's passive movement through fenestrated capillaries (i.e. no ATP used). +3  
hiroshimi  Also, PCT and thick ascending tubule are the two areas that are most susceptible to hypoxic injury in the kidneys. +4  

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