1. Cell Transport Essential Questions
Differentiate passive and active transport.
What is the difference between diffusion and osmosis.

2. Passive Transport

3. I. ___________: An organism tries to maintain a stable internal environment by ________ what ______ and _____ the cell. This is the function of the _____________. It is ___________________________________.
Homeostasis
regulating
enters
leaves
cell membrane
semipermeable or selectively permeable
Wastes
CO2
Excess water
Food
Oxygen
Water
Cell

4. II. The cell membrane is a double layer called a __________.
lipid bilayer

5. III. ______________
A. Cell use ___________. (Like moving _______)
Passive Transport
NO ENERGY
downhill
B. Molecules move from an area of ____ concentration to an area of ___ concentration
High
Low
High Low

6. C. Examples
1. ________: The movement of _________ from an area of _____ concentration to an area of ___ concentration.
Diffusion
molecules
high
low
2. ________: The movement of _____ though a ____________________ membrane from an area of ____ concentration to an area of ___ concentration
Osmosis
water
selectively permeable
high
low
3. ________________ uses transport proteins to move other ions and small molecules across the plasma membrane. Substances move through a transport protein called ______________ that opens and closes to allow substances to diffuse through the membrane
Facilitated diffusion
channel protein

7. A cell is A cell is A cell is placed in a placed in an placed in a
_________ _______ _________
solution solution solution
Hypertonic
Isotonic
Hypotonic
(solution with
equal solute concentration
with that of the cell)
(solution with more solute than the cell
(solution with
less solute
than the cell)
Water
salt (solute-dissolved substance)
Water
Salt (solute)
Water
salt (solute)
water
water
water
Cell shrinks
Water moves in and out of the cell at an equal rate. -- DYNAMIC EQUILIBRIUM
Cell swells and bursts

8. Active Transport

9. a. A cell uses ______ =___. (Like moving _____) energy ATP uphill
IV. _______________
Active Transport
a. A cell uses ______ =___. (Like moving _____)
energy
ATP
uphill
b. Molecules move from an area of _____ concentration to an area of ____ concentration.
low
high
low
high
( Do not reach ___________)
equilibrium

10. C. Examples
1. __________ (_____): The cell takes __ material by forming a pouch (________) around the substance.
Endocytosis
enter in
vacuole

11. 2. _________ (___): A cell moves a substance to the _______ of a cell using a vacuole.
Exocytosis
exit
outside