Shared Flashcard Set

Details

the cell and its environment
testt in science
8
Science
7th Grade
10/26/2008

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Cards

Term
What does selectively pearmeable mean?
Definition

some substances can pass through while others cant.

Term
Explain the comparison between the cell membrane and the gatekeeper
Definition
They are the same thing because the both let some things get through and some not.
Term
What substances are pearmeable through the cell membrane?
Definition

1) oxygen

2) water

3) carbon dioxide

Term
What substances are not pearmeable through a cell membrane?
Definition
 large molecules and salts
Term
What are the 3 methods by which substances can move into and out of a cell?
Definition

1) diffusion

2) osmosis

3) active tansport

Term
What is diffusion?
Definition
Process in which molecules tend to move from an area of high concentration to an area with low concentration
Term
What causes diffusion?
Definition
molecules move and bump into eachother and sometimes there are a lot in one area. they have to move out of the area if it gets too packed.
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