Osmosis and potatoes

Essay specific features

 

Issue:

Science

 

Written by:

Kirstie K

 

Date added:

April 24, 2016

 

Level:

University

 

Grade:

A

 

No of pages / words:

5 / 1228

 

Was viewed:

4309 times

 

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Essay content:

It is customary to express this tendency toward solvent transport in pressure units relative to the pure solvent. If pure water were on both sides of the membrane, the osmotic pressure difference would be zero. But if normal human blood were on the right side of the membrane, the osmotic pressure would be about seven atmospheres! This illustrates how potent the influence of osmotic pressure is for membrane transport in living organisms...
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The choice made here is the opposite of that made in many biology texts, which attribute "high" osmotic pressure to the solution and zero osmotic pressure to pure water. The rationale for the choice is that the energy which drives the fluid transfer is the thermal energy of the water molecules, and that energy density is higher in the pure solvent since there are more water molecules...
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