37.下列水溶液何者不是人類細胞的等張溶液(isotonic solution)？
(A)300 mM glucose
(B)300 mM urea
(C)300 mOsm NaCl
(D)150 mM NaCl

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統計： A(0), B(17), C(12), D(13), E(0) #1347715

詳解 (共 2 筆)

#2136608

Osmolarity solute particles 150 mm nacl 300 mosm 150

https://www.coursehero.com/file/p9ma3l/Osmolarity-solute-particles-150-mM-NaCl-300-mOsm-150-mM-Na-150-mM-Cl-150-mM/


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#2136641

Urea is very permeable through most cell membranes. It exerts littlenosmotic force against a real cell and its membrane. A cell placed inn300 mM urea would rapidly swell as both urea and water entered thencell down their activity gradients.


In the example given above, a 150 mM NaCl solution would benisosmotic to the inside of a cell, and it would also be isotonic--thencell would not swell or shrink when placed in this solution. On thenother hand, a 300 mM urea solution, while still isosmotic would causenthe cell to swell and burst (due to its permeability). This isosmoticnureas solution is not isotonic. Instead it has a lower tonicity (callednhypotonic).

 

http://www.mc3cb.com/lab_assignments_pdf/Calculating_osmolarity_complex_solutions.pdf

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