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Tonicity Explanation

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Tonicity Explanation

Postby UnSHaVeNReaPeR » Tue Jun 09, 2009 6:41 pm

Can someone explain tonicity for me?

I am kinda confuse. It seems to be so complicated.
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Postby jonmoulton » Thu Jun 11, 2009 5:10 pm

Water diffuses from where it is in higher concentration to where it is in lower concentration. If something else is present in aqueous solution, that something displaces water so the water there is in lower concentration. This makes water diffuse into areas with more solute (higher tonicity). That's the process behind osmosis.
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Re: Tonicity Explanation

Postby UnSHaVeNReaPeR » Sat Jun 13, 2009 11:15 am

Then what is meant by hypotonic and hypertonic environment?
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Postby MrMistery » Sat Jun 13, 2009 11:19 am

"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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Re: Tonicity Explanation

Postby UnSHaVeNReaPeR » Sun Jun 14, 2009 5:40 pm

When a red blood cell is placed in distilled water, the cell is hypertonic to the water. The water is hypotonic to the cell.

What is the hypertonic and hypotonic meaning in this sentence?
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Postby MrMistery » Sun Jun 14, 2009 10:09 pm

there's more stuff inside the cell than outside it
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Postby bryanwilliamz » Tue Jun 16, 2009 10:45 am

Tonicity is the concentration of only the solutes that cannot cross the membrane, as only these solutes exert an osmotic pressure upon that membrane. Permeant solutes do not affect tonicity; impermeant solutes do affect it.
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Postby UnSHaVeNReaPeR » Tue Jun 30, 2009 2:07 pm

Oh I see. Thanks!
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Postby mlvkanth » Thu Nov 19, 2009 1:49 pm

A sum of ion of a solution is called the tonicity of a solution
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Re: Tonicity Explanation

Postby bellyjelly » Tue Jul 12, 2011 7:17 am

A state of normal firmness or functional readiness of body tissues or organs; a condition of sustained partial contraction of resting or relaxed muscles.

Tthe osmotic pressure or tension of a solution, as in the cells would swell or shrink depending on the tonicity of the environment.

A property of a solution that depends on the osmotic force exerted across the membrane as influenced by the differing concentrations of solutes in and out of the cell.
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Postby Jastina13 » Mon Aug 01, 2011 7:25 am

"The elastic tension of living muscles, arteries, etc. that facilitate response to stimuli" is a definition of "tonicity".
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Postby einfopedia » Wed Mar 28, 2012 7:44 am

Tonicity is a measure of the osmotic pressure (as defined by the water potential of the two solutions) of two solutions separated by a semipermeable membrane. It is commonly used when describing the response of cells immersed in an external solution. Like osmotic pressure, tonicity is influenced only by solutes that cannot cross the membrane, as only these exert an osmotic pressure. Solutes able to freely cross the membrane do not affect tonicity because they will always be in equal concentrations on both sides of the membrane.

Osmotic pressure is the pressure that must be applied to a solution to prevent the inward flow of water across a semipermeable membrane.

There are three classifications of tonicness that one solution can have relative to another. The three are hypertonic, hypotonic, and isotonic.
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