Download Diffusion Osmosis

Passive Transport
Diffusion
Glue
here
Osmosis
Mnemonics to remember transport:
1. High to low? Go with the flow (passive
transport)
2. Lower to higher? Whew! I’m tired
(active transport)
3. “Endo” means “in”
“Exo” means “out”
Particles moving across a membrane. DOES _________
require _______________________. (ATP)
The movement of particles from an area
of _____________ concentration to an
area of ___________ concentration.
Particles spread to less crowded areas.
This happens across the cell membrane.
Examples: What happens when we spray air
freshener in one corner of the room? What do you
do if your lunch table is too crowded?
Outside Cell
Inside Cell
The movement of _______________
from an area of _____________
concentration of water to an area of
___________ concentration of
water.
Particles spread to less crowded
areas.
Examples: What happens when flowers wilt? What
happens to your cells if you eat a lot of salty foods?
In this case, the water molecules are the smaller
dots. They move across the membrane in an attempt
to make a balance between water and the larger
dots (a solute such as sugar or salt).
Active Transport Basics
Endocytosis
Exocytosis
Glue
here
Sometimes, a cell needs to move particles
against the concentration gradient.
This means particles move from an area of
_____________ concentration to an area of
___________ concentration.
This process requires energy in the form of
_____________
(_______________ TRANSPORT!)
When particles are too big to ENTER through
protein channels, the cell can surround a
particle and create a ____________________
around it using its ____________
____________________.
When particles are too big to EXIT through
protein channels, the cell can
________________ of it by emptying its vesicles
along the cell membrane.
Examples: Would it take a lot of energy to pack
40 shirts into one suitcase? What about walking
against traffic in the hallways between classes?
1. The cell begins to fold in
2. The membrane
surrounds the particle.
3. A vesicle forms for
temporary storage.
1. The vesicle moves
towards the cell membrane.
2. The vesicle fuses
with the cell membrane
3. The vesicle empties
its contents
_________________ substances, like
_____________ and ___________________,
won’t fit through the membrane. They enter the
cell through ______________ _______________
“doorways.”
Because the concentration of particles is higher outside of
the cell than inside, the particles can move in through the
protein channels using energy.