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bluedusk
Forum Elite Topics: 35 Posts: 217 |
Knew this when I started studying and realized recently I'd forgotten it.... How can a solution be iso-osmotic but hypertonic?
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Ahab
| Forum Senior Topics: 9 Posts: 227
Not sure but if I remember my first year physiology labs I think it is due to the presence of Urea
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bluedusk
| Forum Elite Topics: 35 Posts: 217
Awesome - want to take a gander at how?
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mdwannabe
| Forum Guru Topics: 37 Posts: 1131
urea is freely travelable
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bluedusk
| Forum Elite Topics: 35 Posts: 217
right, so you can start off with equiosmolar solutions, but then some urea (or some other permeable solute) can diffuse across the membrane creating an imbalance in tonicity.
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mdwannabe
| Forum Guru Topics: 37 Posts: 1131
yep...dont forget it...common pimping q on rounds
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whereami
| Forum Newbie Topics: 0 Posts: 20
If the urea diffuses into the cell, wouldn't the solution then become HYPOtonic?
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krishie
| Forum Senior Topics: 17 Posts: 126
Hello guys, Urea is a freely travellable substance as mdwannabe said.So it will travel across the membrane till its concentration is equal in both the compartments.Moreover it permeates very quickly.
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krishie
| Forum Senior Topics: 17 Posts: 126
Bluedusk,please correct me if Iam wrong.If we start with equiosmolar solutions,the travelling of urea will continue to keep them in the same state as it maintains an equal concentration in both of them,so much so that it does not contribute to the osmolar calculations.
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