Transcript CELL TRANSPORT

CELL TRANSPORT
• Cell membrane is semipermeable- allows
certain things in, keeps certain things out
• Some molecules can pass right through
small spaces in membrane= DIFFUSIONhigh concentration to low concentration
• Achieves equilibrium
OSMOSIS
• Diffusion of water across membrane=
osmosis
• Cells must maintain certain concentration of
water- water in cell creates osmotic pressure
• Concentration of molecules (salts, sugars,
ions) outside of cell usually = to inside
• Thus- water moves in at the same rate it
moves out
Osmotic Environments
• Isotonic
• Hypotonic
• Hypertonic
OSMOSIS
• Isotonic- ISO- same
• Concentration of solutes is = in and out of
cell
• Cell maintains regular shape
OSMOSIS
• If concentration of solutes in the cell is greater
than outside, then the outside is HYPOTONIC to
the cell
• Cell will swell as water rushes in
• Think 1.) Hypo- under, or low (solution has lower
amount of particles)
• 2.) Hyp
Otonic
• Good for plant cells- creates turgor pressure
OSMOSIS
• If concentration of solutes in the cell is less
than outside, then the outside solution is
HYPERTONIC to the cell
• Cell will shrink because water rushes out
• Think- HYPER= greater (solution has
greater amount of particles)
• Bad for plant cells- cells become
PLASMOLYZED
OSMOSIS
• Water always travels from the hypotonic
area to the hypertonic area
• Hypo------------- Hyper
H2O