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Mr.Martin's test on 1/9/09
a study guide for it
12
Science
8th Grade
01/06/2009

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Cards

Term
6 characteristics of life
Definition
cells, reproduce/grow/repair self, require energy, produce waste, have a life span, respond
Term
Selectively/semipermiable membrane
Definition
some things can go through the cell membrane while others cannot
Term
Osmosis
Definition
The diffusion of water through a selectively permeable membrane
Term
Solute
Definition
the part of the solution that gets dissolved
Term
Diffusion
Definition
the movement of molecules from a area of of high concentration to an area of low concentration
Term
Solvent
Definition
the part of the solution that does the dissolving
Term
Hypotonic
Definition
when there is a higher concentration INSIDE the cell and water enters the cell
Term
Hypertonic
Definition
when the is a higher concentration OUTSIDE the cell and water leaves the cell
Term
Isotonic
Definition
when the concentrations are balanced and water both enters and leaves the cell
Term
Concentration
Definition
the number of solvent particles in comparison to the number of solute particles
Term
Extra cellular fluid (ecf)(4 points)
Definition
surrounds all living cells, contains nutrients and chemicals that the cells need, carries away waste product to be secreted, contains both solute and solvent
Term
Homostasis (what it is and why it is needed)
Definition
it is the balance between concentrations and without it the cell will die
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