buffer during the formation of urine in the nephron QUESTION.

[arc5005]

Which of the following is LEAST likely to act as a buffer during the formation of urine in the nephron?

A. inorganic phosphate
B. bicarbonate
C. myoglobin
D. hemoglobin

Answer: D) hemoglobin

not sure i completely understand this free standing question from TBR. No reasoning provided.

Thank you in advance!

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[Ad2b]

I was thinking size; heme is like 4x as large as myo so for it to be there at all would very unusual.

If it showed up on an actual MCAT like that, I would pick D and be done with it based on the above...

 

[663697]

Myoglobin Buffer?

 

[arc5005]

Thank you thank you!