MadSci Network: Zoology
Query:

Re: why do slugs turn into ooze, when doused with salt?

Date: Tue Dec 29 10:47:38 1998
Posted By: David Sherman, Staff, Sr. Analytical Chemist, Crompton and Knowles ITC
Area of science: Zoology
ID: 909744544.Zo
Message:

The slug turns into "ooze" because a "diffusional gradient" (concentration 
difference) exsists between the liquid inside the slug and the salt 
outside of the slug.  In most natural processes when a diffusional 
gradient is present, the solution seeks a state of equilibrium, meaning 
that the concentrations on the inside and the outside should be the same.  
The concentration of salt inside the slug is much less than the 
concentration of the pure salt on the outside of the slug.  The cell 
membranes of the slug are designed to keep the nutrients and minerals 
inside but can pass water through the membranes.  So the water inside of 
the slug passes through the cell membranes of the slug and tries to dilute 
the salt concentration on the outside of the slug.  The movement of the 
water from the inside of the slug to the outside dehydrates the slug and 
the dehydration turns the slug into ooze.


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