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Kaplan Qbank USMLE



Author3 Posts
  #1

I've read that most electrolytes and organic substances such as urea and glucose are freely permeable across the glomerular membrane as well across the PCT membrane as also is water... therefore the concentration of these as well as the osmolarity remains the same on both sides of the membrane..
The concentration of these substances would obviously stay the same but why the osmolarity? Shouldn't it be different as there are some non-permeable solutes such as proteins?? Someone pls explain..

  #2

Hi guys... someone pls reply... I'm very confused.
I'll be grateful..

  #3

The contribution of proteins to osmolarity is generally quite low, owing to their large size and substantially lower concentration.







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