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Hypotonic, Isotonic and Hypertonic solutions

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Hypotonic, Isotonic and Hypertonic solutions

Postby cool A-level student » Thu Nov 24, 2005 11:23 am

what happens when i put an animal cell or a plant cell in these solutions?

i already know from another topic that animal cells expand in hypotonic solutions which is why ur fingers wrinkle up when u hve a bath or somethin, what about plant cells and the other solutions?

cheers for any answers :D
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answers

Postby cool A-level student » Thu Nov 24, 2005 11:49 am

ive found out that hypotonic solutions transfer water through osmosis to the cell, hypertonic do the opposite and take water from the cell and so mit shrivels, isotonic are "in between" they take as much out as they put in, this i beleive is all due to osmosis as the differences in concentrations mean that water either enters or leaves the cells:

hypotonic=has alot of water and will transfer it into cell where the concentration has lesser than the solutions

isotonic=has equal water to the cell, both cell and solution hve around the same water concentration all the time.

hypertonic=like a water+salt solution, the salt attracts some water particles and lessens the concentration, due to the lower concentration in the solution water moves from the cell to the solution and so shrivels as there is less water inside the cell.

im pretty sure i got this right but if ive made a mistake or u've got something to add please do as i cud use the input :)
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Postby Navin » Thu Nov 24, 2005 12:27 pm

Well ya, you got it right.
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Postby mkw743 » Thu Nov 24, 2005 12:46 pm

when a cell is put in a hypertonic solution, there is net water movement going out of the cell. this casues the cell content to shrink. when excess water is lost, the cell membrane of the plant cell will separate from the cell wall. this is known as plasmolyis
however the cell membrane will not separate completely from the cell wall becaue of the presence of plasmodesmata connecting the adjacent cells.
when a plant cell is put in a isotonic solution, there is no net water movemnent.
when a plant cell is put in a hypotonic solution, there is net water movement going into the cell. this cause the cell to swell. however the cell would not burst due to the presence of the rigid cell wall. at the same time, pressure potential is built against the incoming water and teh water potential of the cell will become the same as the surrounding solution and osmosis stops.
i hope this can help you a little bit. if i have made any mistakes, pls correct it
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Postby cool A-level student » Thu Nov 24, 2005 1:55 pm

cheers guys
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Postby deenteen » Thu Nov 24, 2005 8:47 pm

hypo-less than
[color=darkblue]hyper-more than
iso-same as[/color]these compare the concentration of solution/osmotic pressure outside the cell to the inside. ex-if you put cell in hypotonic, it means that the osmotic pressure outside is less than the indide, meaning that the cell will swell, and if this is not controlled than cell will burst. iso, the cell stays the same. hyper, the cell shrinks because the opposite happens.
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Postby mikki » Fri Nov 25, 2005 8:49 pm

My lab instructor wrote this on an overhead one day to help us remember what hypertonic meant. It's very effective. Lol

HYPERTONIC SUCKS
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Postby deenteen » Sat Nov 26, 2005 7:23 pm

datz funny! :D
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Postby Jolo » Tue Mar 07, 2006 3:17 am

Hey I just whanted to know

If our cells and body fluids are hypertonic to teh water of a swimming pool, then why do we not swell and pop when we go for a swim?
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Postby canalon » Tue Mar 07, 2006 4:46 am

Hint: skin, kidneys... Plus we do swell a little bit (look at your fingers).
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Postby MrMistery » Tue Mar 07, 2006 6:33 pm

because your hipodermus is impermeable to water, and skin cells also have keratin to prevent it..
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Postby WFerrara » Tue Oct 27, 2009 3:00 am

wait Jolo,
hypertonic means that the cells shrink. If our body fluids are hypertonic to water wouldn't that mean that our "body" shrinks?

your saying that our bodies are hypotonic- which means that out cells would swell up. So which do you mean:
hypertonic or hypotonic?
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