Download Cell Transport Power Point

Cell Membrane
• The cell membrane consists of a double layer of
phospholipids.
Layer 1
Attracts Water
Layer 2
Repels Water
Cell Membrane
• The cell membrane controls/ regulates what
enters and leaves the cell.
• This allows the cell to maintain homeostasis.
• Homeostasis is the process of maintaing a
constant/stable internal environment.
Cell Membrane
• The cell membrane is
selectively permeable.
It “selects” which
substances to allow in
and out of a cell.
• The cell membrane is
permeable to
substances that are
able to cross the
membrane.
• Impermeable means
substances are unable
to cross the cell
membrane.
Impermeable
Permeable
Cell Transport
(Movement Through the Cell Membrane)
• Every cell has liquid on the inside and liquid
on the outside.
Cell Transport
• One of the most
important
functions of the
cell membrane is
to regulate the
movement of
molecules from
one side of the
membrane to the
other.
• The molecules
move through a
solution which is
the cytoplasm of
the cell.
Yeah!
What is
cytoplasm?
Cytoplasm is the material inside a
cell that contains the cell organelles
Cytoplasm is a solution ??????
What is a solution?
A liquid mixture of two or more substances
in which the molecules of the substance are
EVENLY mixed
What is a solute?
Gets dissolved in a solution
What is a solvent?
Does the dissolving in the solution
Find A Friend and Think Solutions
Think of 4 different
solutions. Identify
the solute and
solvent in your
solutions. Write
down and turn in!
Types of Cellular Transport
•
Passive Transport
cell doesn’t use energy
1. Diffusion
2. Facilitated Diffusion
3. Osmosis
•
Weeee!!!
high
low
Active Transport
cell does use energy
1. Endocytosis
2. Exocytosis
This is
gonna be
hard
work!!
high
low
Diffusion Across Cell Membrane
Passive Transport
Diffusion
• In a solution, molecules
move constantly.
• Molecules tend to move
from an area of high
concentration to an
area of low
concentration.
• This process ( moving
from high to low) is
called diffusion.
• Diffusion does not
require energy.
Passive Transport
Facilitated Diffusion
• Does not require energy
• Facilitated Diffusion: movement of certain
molecules across the cell membrane with the
assistance of a protein channel.
Protein Channel
Passive Transport
Osmosis
• Osmosis: the diffusion of WATER across the cell
membrane.
• Water will move across the cell membrane until
equilibrium is reached.
• Three ways cells are effected by osmosis:
1. Hypotonic
2. Hypertonic
3. Isotonic
Osmosis
Hypotonic Solution
• Hypotonic: more water
on the outside of the
cell than the inside.
• Water will diffuse from
high to low causing
water to enter the cell
• This will cause the cell
to swell and burst.
• Cytolysis: the bursting
of a cell
Normal Blood
Cell
Blood Cell in
Hypotonic Solution
Hypotonic Solution Video
Blood Cells
http://www.linkpublishing.com/videotransport.htm#Blood-_Hypotonic_Solution
Notebook Break
1) What “word” do you ALWAYS associate (think of) with
osmosis?
Water
2) In a hypotonic solution does a cell shrink or swell?
The cell will swell.
3) What causes the cell to shrink or swell?
The solution of water is greater on the outside of the cell
so water will enter the cell.
4) What is cytolysis? The bursting of a cell
How can you remember that
a hypotonic solution makes
a cell get bigger?
•
•
Hypo = Hippo
A hippo drinks lots of water and can
be very BIG.
• Hypo/Hippo makes a cell get bigger!
Osmosis
Hypertonic Solution
• Hypertonic: more water
on the inside of the cell
than the outside of the
cell.
• Water will diffuse from
high to low causing
water to leave the cell
• This will cause the cell
to shrink.
• Plasmolysis: the
shrinking of a cell.
Normal Blood Cell
Blood Cell in
Hypertonic Solution
Hypertonic Solution Video
Red Blood Cells
http://www.linkpublishing.com/videotransport.htm#Blood_-_Hypertonic_Solution
How can you remember that
a hypertonic solution makes
a cell get smaller?
•
•
Hyper = Hyper kid in class.
The teacher “kicks” the hyper kid out
and the class size gets SMALLER (one less
student)
• Hyper/Hyper kid makes a cell get smaller!
Osmosis
Isotonic Solution
• Isotonic: same amount
of water on both the
outside and inside of a
cell.
• Water flows evenly
across the cell
membrane
• Cell is its normal size
Isotonic Solution Video
Red Blood Cells
http://www.linkpublishing.com/videotransport.htm#Blood__Isotonic_Solution
How can you remember that
a isotonic solution makes
a cell stay in a state of equilibrium?
•
•
Iso = “ I so HAPPY!
The amount water both inside and
outside the cell are the same. It’s equal on
both sides!
• This mean the cell is “happy!”
How well do you know your solutions in a cell?
Identify each illustration as hypotonic, hypertonic, or isotonic.
2.
1.
4.
3.
6.
5.
Active Transport
• Requires energy
• Movement from an area of low to high concentration
• Two types of Active Transport:
Endocytosis
Exocytosis
Movement of material
into the cell
Movement of material
out of the cell
En = In the cell
Ex = Exit the cell
Endocytosis
Single celled organism engulfing food
Phagocytosis: a very large particle moving across the
cell membrane
Exocytosis
Osmosis Activitiy
Hypotonic Hypertonic
Osmosis
Create a
Crossword
Puzzle with
terms from Cell
Membrane
Notes and Cell
Transport
Notes.
Create a
Multiple Choice
Test for the
Cell Membrane
Notes and Cell
Transport
Notes.
Create a Cell
Membrane and
Cell Transport
lesson to
present to the
class. Include
visuals and
examples.
Minimum of 20
Minimum of 20
and choices
A-D.
Be prepared to
teach the class
Monday 
Isotonic
Create a Fill In
the Blank Story
about the Cell
Membrane and
how
substances are
transported
across the cell
membrane.
Minimum of 20
and provide a
word bank.