brief answer question~ plz help~

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darkm
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brief answer question~ plz help~

Post by darkm » Wed Nov 09, 2005 5:25 am

why is hypertonic a disadvantage to a cell?
and why is hypotonic a disadvantage to a cell?

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jnkdna
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Post by jnkdna » Wed Nov 09, 2005 8:40 am

a hypertonic is a disadantage because if there is more solute inside the cell than outside, water will keep entering the cell till both are isotonic. this can cause the cell 2 burst.
a hypotonic solution is a disadvantage because if there is more solute outside the cell than inside, water will keep moving out of the cell till both are isotonic. the cell will lose all its water & die.

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MrMistery
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Post by MrMistery » Wed Nov 09, 2005 7:13 pm

Fortunately the cell can create controlled gradients of Ca2+, Na+ and H+ to keep the water inside
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darkm
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Post by darkm » Wed Nov 09, 2005 11:09 pm

jnkdna wrote:a hypertonic is a disadantage because if there is more solute inside the cell than outside, water will keep entering the cell till both are isotonic. this can cause the cell 2 burst.
a hypotonic solution is a disadvantage because if there is more solute outside the cell than inside, water will keep moving out of the cell till both are isotonic. the cell will lose all its water & die.



hey~ thx a lot!!

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biostudent84
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Post by biostudent84 » Wed Nov 09, 2005 11:25 pm

MrMistery wrote:Fortunately the cell can create controlled gradients of Ca2+, Na+ and H+ to keep the water inside


Not about the Ca2 and the H+ being controlled. But you are definelty right about the Na+. There is a protein in the cell membrane called the Sodium-Potassium Pump (Abbreviated "Na+/K+ pump"). It is constantly pumping Na+ out of the cell...because Na+ is constantly being allowed in. Many different molecules (glucose included) hitch a ride on Na+ molecules as it rides the concentration gradient back into the cell.

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