Into and Out of the Cell
Transcript Into and Out of the Cell
INTO & OUT OF THE CELL!!!
Cells need to get nutrients and gases in
through the cell membrane.
Wastes must be able to leave the cell.
cell membrane is “picky” about what
enters and leaves the cell. The membrane is
Cells live with liquids all around—
water/salts/gases are dissolved in this liquid.
Concentration is a measure of how much of 1
substance is dissolved in a certain amount of
Cells like to keep things equal!! This is called
When things are unequal—things move to make it
This is known as DIFFUSION
Molecules moves from areas of high
concentration ( crowded ) to areas of lower
concentration ( spread out )
If the substance moving is WATER—special
kind of diffusion known as-- OSMOSIS
Diffusion & Osmosis—require no ENERGY
just happens to equal things out!!
Some molecules are to big to diffuse in/out—
they must use energy—this movement is called