cell trasport

1. WARM UP

2. THE CELL
BOUNDARIES
T H E C E L L M E M B R A N E A N D C E L L W A L L

3. THE BORDERS
•The most important parts of a cell
are its borders, which separate the
cell from its surroundings.
•All cells are surrounded by a thin
flexible barrier known as
____________

4. The Cell Membrane

5. THE BORDERS
•--- Some cells produce a strong
supporting layer around the
membrane known as the cell
wall.
• What type of cell would
have these?

6. Plant Cells

7. CELL MEMBRANE
•The cell membrane
regulates what enters and
leaves the cell
•--- Cell membranes are
made of a double layer sheet
called a lipid bilayer.

8. LIPIDS
•REMEMBER!!!! What is a
lipid?

9. DEFINITION OF A LIPID
A lipid is a type of organic
compound found in all
living things. Lipids are not
soluble in water and are
made of carbon and
hydrogen atoms.

10. LIPID BILAYER
•The lipid bilayer gives the
cell membrane a flexible
structure that forms a strong
barrier between the cell and
its surroundings

13. PROTEINS
• Most cell membranes contain
protein , which are embedded in
the lipid bilayer.
• ---- Some of the proteins form
channels and pumps that help to
move material across the cell
membrane.

14. IMPORTANT
•**** One of the most important
functions of the cell membrane
is to regulate the movement of
dissolved molecules to the
liquid side on the other side.

15. TRANSPORT
ACROSS
MEMBRANES
W H AT I S D I F F U S I O N , O S M O S I S , FA C I L L AT E D
D I F F U S I O N A N D A C T I V E T R A N S P O R T

16. CELLULAR TRANSPORT
• Cellular transport is the process of molecules or material moving
in and out of the cell
• There are two types of transport within the cell.
• Passive Transport
• Active Transport

17. PASSIVE TRANSPORT
• Passive transport is the movement of molecules in or out of the cell
without the use of energy
• Can only occur if the molecules moving in and out of the cell are:
– Small
– Uncharged (meaning they contain NO + or – which are ions)
– Move from an area of high concentration to an area of low concentration
• There are three types of passive transport: diffusion, osmosis, and
facilitated diffusion

18. DIFFUSION
• Movement of particles from an area of higher concentration to
an area of lower concentration until an equilibrium is established
• doesn’t require energy

19. NOTE:
•In the cell membrane if a substance
has an unequal concentration on
either side the particles will move to
the area of low concentration until
an equilibrium is established

20. HERE IS EXAMPLE

21. LETS REVIEW
• What is diffusion in your own words

22. THINK, PAIR, SHARE
• Think for a moment about Cellular Transport. What do you think
would be a good method to help a 4th grade student understand
what cellular transport means?

23. PAIR
• Pair with someone who's the same or similar height as you. Talk
with them about your method.

24. SHARE
•Share some of
your ideas with the
class

25. THINK
• What is a major characteristic of Passive Transport? Think of
the two types of passive transport you learned about, how could
you teach this to the 4th grade student using a diagram?

26. PAIR
• Pair with your neighbor, using an expo marker draw your
diagrams on the desk.

27. SHARE
• Share your diagrams with the class

28. GO TO QUIZIZZ
•Here is your
code
•596808
• When complete, label your notes

29. OSMOSIS
• Diffusion of water across a selectively permeable membrane
(some substances can pass through and some can’t)

30. WATCH THE
EXAMPLE

31. OSMOTIC PRESSURE
• For an organism to survive it must have a way to balance the
intake and loss of water.
• Pressure produced by osmosis can sometimes be fatal to plant
and animal cells
• Keep in mind water follows the solute

32. BEFORE WE BEGIN.
• What do the prefixes mean:
a. iso
b. hyper
c. hypo

33. HYPERTONIC SOLUTION
HIGHER SOLUTE CONCENTRATION OUTSIDE THE
CELL THAN INSIDE
• In animal cells,
- cell will lyse (shrink)
• In plant cells,
- cell will become plasmolyzed
(shrink)

34. HYPOTONIC SOLUTION
LOWER SOLUTE CONCENTRATION OUTSIDE
THE CELL THAN INSIDE
• In animal cells
- cell will become
swollen and burst
• In plant cells,
- cell will become turgid (very
firm, swollen and hard)
- this is normal for plant cells

35. ISOTONIC SOLUTION
THERE IS THE SAME SOLUTE CONCENTRATION
INSIDE AND OUTSIDE OF THE CELL
• In animal cells
- the cell will be
normal
• In plant cell
- will be flaccid (limp)
**green parts of the plant droop
and are unable to hold their
leaves towards the sun**

36. LET’S WATCH
ANOTHER
EXAMPLE
Another example

37. FACILITATED DIFFUSION
• Movement of specific molecules across cell membranes through
protein channels.
• These specific molecules bind to a protein and are channeled
from the outside of the cell to the inside
• Is fast and specific
• Will still only occur if concentration is higher on one side of the
membrane than the other.

38. ACTIVE TRANSPORT
•How do YOU think active transport
differs from passive transport?

39. ACTIVE TRANSPORT
• The passing of molecules across a membrane against the
concentration gradient
• Requires energy
• Small molecules are transported by pumps (molecular transport)
• Larger molecules are transported by endocytosis and exocytosis.

40. ENDOCYTOSIS
• Process of taking material into the cell by means of forming a
vesicle or pockets of the cell membrane
• This takes material into the cell and it forms a vacuole in the cell
• Large molecules of food and whole cells can be taken this way

41. TWO TYPES OF
ENDOCYTOSIS
Phagocytosis
• Means “cell eating”
• An extension of cytoplasm
surrounds a particle and
package it into a food
vacuole
• requires an enormous
amount of energy
Pinocytosis
• Means” cell drinking”
• Tiny pockets form along the
cell membrane fill with liquid
and form vacuoles with in
the cell
• Requires enormous
amounts of energy

42. EXOCYTOSIS
• The process where cells release large amount of materials
• Vacuole surrounding material fuses with the cell membrane,
forcing the contents out of the cell
• Also requires energy

43. SO LET’S WRAP IT
ALL UP
F I R S T V I D E O