cell transport

1. Moving Cellular Material
Ch. 2.3

2. 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?

3. 1. How do materials enter & leave cells?
Cell
transport
No energy/ATP Energy/ATP
Passive
transport
Diffusion
Facilitated
diffusion
Osmosis
transport = move
Active
transport
Endocytosis Exocytosis
Copy this
chart

4. 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

5. 1. How do materials enter & leave cells?
Diffusion:
When molecules move from HIGH to
LOW concentration
ALWAYS: High Low
Until both sides reach equilibrium.

6. Draw this example of diffusion.

7. 1. How do materials enter & leave cells?
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)

9. 1. How do materials enter & leave cells?
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

10. Facilitated
diffusion

11. 1. How do materials enter & leave cells?
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.

12. Active Transport

13. 1. How do materials enter & leave cells?
Endocytosis: (endo = enter)
takes in a substance by surrounding it (&
engulfing)
Exocytosis: (exo = exit)
Getting rid of contents outside the cell

14. Endocytosis & Exocytosis

15. 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

16. 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

17. Remotes Review

18. What is the diffusion of water
molecules?
A. Diffusion
B. Endocytosis
C. Active transport
D. Osmosis
E. Exocytosis
0 0 0 0 0
Diffusion
Endocytosis
Active transport
Osmosis
Exocytosis
45

19. What is the movement of substances
from areas of high concentration to low
concentration?
A. Diffusion
B. Endocytosis
C. Active transport
D. Exocytosis
Diffusion
0 0 0 0
Endocytosis
Active transport
Exocytosis
45

20. What is the movement of substances
across a membrane that requires cell
energy?
A. Diffusion
B. Osmosis
C. Active transport
D. Passive
transport
Diffusion
0 0 0 0
Osmosis
Passive transport
Active transport
45

21. When substances are too large to pass
through the membrane, they must enter
the cell through what process?
A. Osmosis
B. Endocytosis
C. Exocytosis
D. Passive
transport
Osmosis
0 0 0 0
Endocytosis
Exocytosis
Passive transport
45

22. Which cell part is responsible for
making and storing the energy (ATP)
needed for active transport?
A. Chloroplast
B. Nucleus
C. Golgi bodies
D. Mitochondria
E. Lysosome
Chloroplast
0 0 0 0 0
Nucleus
Golgi bodies
Mitochondria
Lysosome
45

23. Osmosis is the diffusion of
water molecules though which
of these?
0 0 0 0
A. B. C. D.
A. channel proteins
B. water
C. cell wall
D. Cell membrane
45

24. What does facilitated diffusion require
to pass molecules through a cell
membrane?
0% 0% 0% 0%
A. B. C. D.
A. water
B. glucose
C. light energy
D. transport
proteins
45

25. During which process do cells take in
needed nutrients from the environment
through carrier proteins?
0 0 0 0
A. B. C. D.
A. endocytosis
B. active transport
C. exocytosis
D. passive transport
45

26. How does active transport move
substances through the cell
membrane?
0 0 0 0
A. B. C. D.
A. using the cell’s
energy
B. by osmosis
C. by facilitated
diffusion
D. using water
45

27. Link for animation
http://www.northland.cc.mn.u
s/biology/biology1111/animati
ons/active1.swf