Cells and Cell Processes Notes
Passive Transport
1. Diffusion:
__________________________________________________________________________________________
__________________________________________________________________________________________
•
•
Results in natural motion of particles, which causes the molecules to collide / bump into one another
and scatter.
Concentration gradient:
____________________________________________________________________________________
____________________________________________________________________________________
o What does diffusion move?
__________________________________
__________________________________
__________________________________
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Cells and Cell Processes Notes
2. Osmosis:
__________________________________________________________________________________________
__________________________________________________________________________________________
•
•
•
•
Most cells have special water proteins called ________________________________.
o Type of channel protein that facilitates the passage of water.
The higher the concentration of dissolved particles in a solution, the lower the concentration of water
molecules in the same solution.
Water diffuses across a membrane from the region of lower solute concentration to the region of
higher solute concentration until the solute concentration is equal on both sides.
Review terminology:
o Solute:________________________________________________________________________
_____________________________________________________________________________
o Solvent:_______________________________________________________________________
_____________________________________________________________________________
•
Solutions are described based on their _______________________, or concentration of solutes in the
water, inside and outside the cell.
o ___________________________________
o ___________________________________
o ___________________________________
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Cells and Cell Processes Notes
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Cells and Cell Processes Notes
3. Facilitated Diffusion
__________________________________________________________________________________________________
__________________________________________________________________________________
o
o
o
o
Facilitate means “to make easier”.
___________________________________ make it easier for larger molecules to enter and exit the cell.
They span the entire membrane.
Some bind to only one molecule. Some bind to two different molecules.
Examples: ____________________, _______________________,
______________________________, and ____________________.
Still passive transport because there is no energy required.
Several types of transport proteins:
o Channel proteins:
_____________________________________________________________________________________
_____________________________________________________________________________________
o Carrier proteins:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
o Gated channels:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
Why is it important for glucose to pass through the membrane quickly?
__________________________________________________________________________________________________
__________________________________________________________________________________
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Cells and Cell Processes Notes
USES
Active Transport
ATP
1. Protein pumps
o
o
o
o
o
Move materials ___________________________________________________________________
Uses _____________________ to move the molecules
Moves materials from ___________________ the concentration gradient.
The proteins are often referred to as ______________________________
Why use active transport?
___________________________________________________________________________________________
___________________________________________________________________________________________
o
Where does the energy come from?
___________________________________________________________________________________________
___________________________________________________________________________________________
2. Bulk Transport
Endocytosis and Exocytosis transports materials across the membrane in vesicles.
Endocytosis____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
Pinocytosis____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
Phagocytosis____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
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Cells and Cell Processes Notes
Exocytosis____________________________________
____________________________________
____________________________________
____________________________________
____________________________________
Complete the table.
Transport Method
Active (ATP) or
Passive (KINETIC
ENERGY)
Does any structure help?
DIFFUSION
FACILITATED
DIFFUSION
OSMOSIS
SODIUM-POTASSIUM
(NA+ -K+) PUMp
ENDOCYTOSIS
(PHAGOCYTOSIS)
ENDOCYTOSIS
(PINOCYTOSIS)
EXOCYTOSIS
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Example of substance(s) that
use this method of transport
in cells
Cells and Cell Processes Notes
Directions: Identify the type of transport depicted in the diagrams.
Diffusion
Facilitated Diffusion
Endocytosis
Osmosis
Sodium -Potassium Pump / Active Transport
________________________
Phagocytosis
Channel protein
Exocytosis
Carrier protein
________________________
____________________________________
_________________________________
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Cells and Cell Processes Notes
_____________________________
___________________________
_____________________________________
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