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Ch. 2.3: Cell transport
Essential Questions
1. How do materials enter & leave cells?
2. What is the difference between passive transport & active transport?
3. Why are osmosis and diffusion important?
Cell transport
Passive transport
Diffusion
Facilitated diffusion
Osmosis
Active transport
Endocytosis Exocytosis
1. How do materials enter & leave cells?transport = move
No energy/ATP Energy/ATP
Copy this chart
Diffusion:When molecules move from HIGH to
LOW concentration
ALWAYS: High LowUntil both sides reach equilibrium.
1. How do materials enter & leave cells?
Draw this example of diffusion.
Osmosis:The diffusion of WATER molecules
through a membrane.
It always moves from areas with higher concentration of WATER to areas of lower concentration of water.
Dilute solution Concentrated solution(high water) (low water)
1. How do materials enter & leave cells?
(water)
Facilitated diffusion:When molecules use transport
proteins to pass through a cell’s membrane.
2 types of transport proteins:Carrier proteins – carry large molecules
(glucose)Channel proteins – form pores through
membrane
1. How do materials enter & leave cells?
Facilitated diffusion
Active Transport:When substances move through the
cell membrane using the cell’s energy (ATP).
Low High
Uses carrier proteins to get nutrients from the environment and to get rid of waste materials.
1. How do materials enter & leave cells?
Active Transport
Endocytosis: (endo = enter)takes in a substance by surrounding it (&
engulfing)
Exocytosis: (exo = exit)Getting rid of contents outside the cell
1. How do materials enter & leave cells?
Endocytosis & Exocytosis
Passive transport vs. Active transport
Passive transport Active transportBoth
- No energy (ATP)
- High Low
- Uses energy (ATP)
- Low High, or large molecules
- Transport substances through cell membrane
3. Why are osmosis & diffusion important?
All living things have certain requirements they must satisfy in order to remain alive & to
Cells use passive & active transport to maintain homeostasis by:– Exchange gases (O2 & CO2)– Get water, minerals, & food– Get rid of wastes
Remotes Review
What is the movement of substances from areas of high concentration to low
concentration?A. DiffusionB. EndocytosisC. Active transportD. Exocytosis
45Diffusio
n
Endocytosis
Active
transp
ort
Exocyt
osis
0 000
What is the movement of substances from areas of high concentration to low
concentration?A. DiffusionB. EndocytosisC. Active transportD. Exocytosis
45Diffusio
n
Endocytosis
Active
transp
ort
Exocyt
osis
0 000
What is the diffusion of water molecules?
A. DiffusionB. EndocytosisC. Active transportD. OsmosisE. Exocytosis
Diffusion
Endocytosis
Active
transp
ort
Osmosis
Exocyt
osis
0 0 000
45
What is the diffusion of water molecules?
A. DiffusionB. EndocytosisC. Active transportD. OsmosisE. Exocytosis
Diffusion
Endocytosis
Active
transp
ort
Osmosis
Exocyt
osis
0 0 000
45
What is the movement of substances across a membrane that requires cell
energy?A. DiffusionB. OsmosisC. Active transportD. Passive
transport
45Diffusio
n
Osmosis
Active
transp
ort
Passive tr
ansp
ort
0 000
What is the movement of substances across a membrane that requires cell
energy?A. DiffusionB. OsmosisC. Active transportD. Passive
transport
45Diffusio
n
Osmosis
Active
transp
ort
Passive tr
ansp
ort
0 000
When substances are too large to pass through the membrane, they must enter
the cell through what process?A. OsmosisB. EndocytosisC. ExocytosisD. Passive
transport
45Osm
osis
Endocytosis
Exocyt
osis
Passive tr
ansp
ort
0 000
When substances are too large to pass through the membrane, they must enter
the cell through what process?A. OsmosisB. EndocytosisC. ExocytosisD. Passive
transport
45Osm
osis
Endocytosis
Exocyt
osis
Passive tr
ansp
ort
0 000
Which cell part is responsible for making and storing the energy (ATP)
needed for active transport?A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome
45Chloroplast
Nucleus
Golgi bodies
Mitoch
ondria
Lysoso
me
0 0 000
Which cell part is responsible for making and storing the energy (ATP)
needed for active transport?A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome
45Chloroplast
Nucleus
Golgi bodies
Mitoch
ondria
Lysoso
me
0 0 000
Osmosis is the diffusion of water molecules through which of
these?
A. B. C. D.
0 000
A. channel proteinsB. waterC. cell wallD. membrane
45
Osmosis is the diffusion of water molecules through which of
these?
A. B. C. D.
0 000
A. channel proteinsB. waterC. cell wallD. membrane
45
What does facilitated diffusion require to pass molecules through a cell
membrane?
A. B. C. D.
0% 0%0%0%
A. waterB. glucoseC. light energyD. transport
proteins
45
What does facilitated diffusion require to pass molecules through a cell
membrane?
A. B. C. D.
0% 0%0%0%
A. waterB. glucoseC. light energyD. transport
proteins
45
How does active transport move substances through the cell
membrane?
A. B. C. D.
0 000
A. using the cell’s energy
B. by osmosisC. by facilitated
diffusionD. using water
45
How does active transport move substances through the cell
membrane?
A. B. C. D.
0 000
A. using the cell’s energy
B. by osmosisC. by facilitated
diffusionD. using water
45
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