Ch. 2.3 Cell transport
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Transcript of Ch. 2.3 Cell transport
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Moving Cellular MaterialCh. 2.3
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Focus 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?
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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
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Check your vocabulary activity
See 2.3 Vocabulary You should already have the
definitions that have a dotted underline
Add the direction particles move to your vocabulary
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Diffusion:When molecules move from HIGH to
LOW concentration
ALWAYS: High Low
Until both sides reach equilibrium.
1. How do materials enter & leave cells?
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Draw this example of diffusion.
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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)
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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?
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Facilitated diffusion
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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?
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Active Transport
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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?
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Endocytosis & Exocytosis
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2. What is the difference between passive transport & active transport?
Passive transport – does NOT require cell’s energy (no ATP)– depends on differences in
concentration of substances – moves from high low
Active transport – requires cell’s energy (ATP)– Moves from low high
Activ
e tr
ansp
ort
Passive transport
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3. Why are osmosis & diffusion important?
All living things have certain requirements they must satisfy in order to remain alive & to maintain homeostasis by:– Exchanging gases (O2 & CO2)– Taking in water, minerals, & food– Eliminating wastes
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Remotes Review
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What is the diffusion of water molecules?
A. DiffusionB. EndocytosisC. Active transportD. OsmosisE. Exocytosis
Diffusio
n
Endocyto
sis
Active
transp
ort
Osmosis
Exocy
tosis
0 0 000
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What is the movement of substances from areas of high concentration to low
concentration?A. DiffusionB. EndocytosisC. Active transportD. Exocytosis
Diffusio
n
Endocyto
sis
Active
transp
ort
Exocy
tosis
0 000
45
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What is the movement of substances across a membrane that requires cell
energy?A. DiffusionB. OsmosisC. Active transportD. Passive
transport
Diffusio
n
Osmosis
Active
transp
ort
Passiv
e tran
sport
0 000
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When substances are too large to pass through the membrane, they must enter
the cell through what process?
A. OsmosisB. EndocytosisC. ExocytosisD. Passive
transport
Osmosis
Endocyto
sis
Exocy
tosis
Passiv
e tran
sport
0 000
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Which cell part is responsible for making and storing the energy (ATP)
needed for active transport?
A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome
Chloroplast
Nucleus
Golgi bodies
Mito
chondria
Lyso
some
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Osmosis is the diffusion of water molecules though which of
these?
A. B. C. D.
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A. channel proteinsB. waterC. cell wallD. Cell membrane
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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
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During which process do cells take in needed nutrients from the environment
through carrier proteins?
A. B. C. D.
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A. endocytosisB. active transportC. exocytosisD. passive transport
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How does active transport move substances through the cell
membrane?
A. B. C. D.
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A. using the cell’s energy
B. by osmosisC. by facilitated
diffusionD. using water
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Link for animation
http://www.northland.cc.mn.us/biology/biology1111/animations/active1.swf