Anybody else pissed off about questions on the 2005 exam? Well,
here's a couple that Dr. Fill's decided have more than one correct
answer.
#45:
> Answer: A My answer: C. I understand that low concentration of plasma
> proteins decreases plasma oncotoic pressure, which is one of the three
> factors contributing to NFP, which determines GFR. Doesn't increased
> plasma sodium lead to increased GFR as well? My reasoning: increased
> plasma Na leads to increased blood volume, leading to increased
> arterial pressure and increased GFR. Am I missing something? QUESTION
> #45 IN MY VIEW HAS TWO POTENTIALLY CORRECT ANSWERS (A & C). ANSWER C
> IS CORRECT FOR EXACTLY THE REASON REASON YOU STATED.
>
> #52:
> The correct answer is A, and my answer was B. What determines the
> level of reabsorption of urea in the PCT? I know from lecture that
> Urea diffuses passively through the paracellular pathway in the PCT.
> It seems to me that increasing the concentration of anything in the
> lumen of the PCT will decrease the oncotic pressure that drives urea
> reabsorption, be it glucose (as in answer A) or sodium (as in answer
> B). I know there must be a nuance i am missing for this one.
> AGAIN....THERE ARE TWO POTENTIALLY CORRECT ANSWERS (A & B). YOU ARE
> CORRECT. INCREASING THE CONCENTRATION OF ANYTHING IN THE LUMEN OF THE
> PCT WILL DO IT. THERE IS NOT NUANCE. THIS IS JUST A BAD QUESTION IN MY
> VIEW.
>
> #74:
> Correct answer: D. My answer: A. I feel like I'm going crazy. Do
> aldosterone, ADH, and ANP not regulate the Tm of sodium reabsorption?
> Are these not the mechanisms for control of sodium plasma
> concentration? YOU ARE NOT GOING CRAZY. YOUR READ OF THIS QUESTION IS
> JUST LIKE MINE. YOU ARE ABSOLUTELY CORRECT ANSWER A IS CORRECT FOR THE
> REASON YOU STATE. ANSWER D IS ALSO CORRECT BECAUSE OF PTH ACTIONS.
> THIS IS JUST A BAD QUESTION WITH MULTIPLE POSSIBLE ANSWERS.
Good luck all,
Mike