Transcript Cell Transportx

Do Now: (take out homework)
 Advertisements for sports drinks, such as Gatorade,
seem to be everywhere. All of these drinks are
supposed to help your body recover and replenish
lost electrolytes, fluids, and vitamins after exercise.
 How do the essential molecules contained in the
drinks get into your cells quickly to help you recover
after exercise?
 Do YOU think they really work? Why or why not?
Cell Transport
Getting into a cell
Review:What cell organelle
controls which materials may
enter or leave the cell?
CELL MEMBRANE
Cell (plasma) membrane
 Cells need an inside & an outside…
 separate cell from its environment
cell membrane is the boundary
IN
food
- sugars
- proteins
- fats
salts
O2
H2O
OUT
waste
- ammonia
- salts
- CO2
- H2O
products
- proteins
cell needs materials in & products or waste out
What IS a membrane?
Review:Which organic
compound makes up ALL
cell membranes??
What do you know doesn’t mix with water?
LIPIDS!
(Phospholipids specifically)
Building a membrane
 How do you build a barrier that keeps the
watery contents of the cell separate from
the watery environment?
 FATS 
 LIPIDS 
Remember:
oil & water
don’t mix!!
What substance
do you know that
doesn’t mix with
water?
Lipids of cell membrane
 Membrane is made of special kind of lipid
 phospholipids
 “split personality”
“attracted to water”
 Membrane is a double layer
phosphate
 phospholipid bilayer
inside cell
lipid
“repelled by water”
outside cell
Crossing the cell membrane
 What molecules can get through
the cell membrane directly?
 fats and oils can pass directly through
inside cell
waste lipid
sugar
outside cell
aa
salt
H2O
but…
what about
other stuff?
Two Ways of Transportation
PASSIVE
 Does not require
ATP
 Examples:
 Diffusion
 Osmosis
 Facilitated
diffusion
ACTIVE
 Requires the use
of ATP
 Examples:
 Endocytosis
 Exocytosis
 Phagocytosis
 Pinocytosis
POGIL
 Membrane structure and function
Complete model 1 – simple
diffusion
Model 2 – The selectively
permeable membrane
 7, 8, 12 - 17
POGIL Review
 Important vocabulary:
 Diffusion
 Concentration
 Concentration gradient
 Dynamic Equilibrium
 Summary:
 http://www.brainpop.com/science/cellularlifeandgenetics/passivetra
nsport/Egg diffusion
Good Afternoon 
 Do Now:
 Copy down homework
 Castle Learning due THURSDAY
 UNIT EXAM FRIDAY
 After school review Jeopardy: 3:00pm Thursday room
108 - Come for extra credit points!
 Correctly answer the following questions QUIETLY and
turn in to bin.
 What are the three components that make up a
plasma membrane?
 Molecules naturally spread from areas of high
concentration to an area of low concentration. This is
called _____________ and is a form of
passive/active transportation.
EGG LAB
Do Now:
Take out egg lab
Get together in your lab group
READ DAY 2 PROCEDURES
TOGETHER
DO NOT PROCEED!!!
Egg Lab
 Important concepts
Passive Transport!
 Diffusion – movement of substances
 Osmosis – movement of water
 Hypertonic
(to shrink)
 Hypotonic (to swell)
Egg Lab Flow Chart
 Retrieve one egg
 Run warm water over the outside of the egg and







GENTLY rub away remaining egg shell
Measure the initial mass and circumference of the egg
Label a cup with your group name and solution
Fully submerge the egg in the given solution
Let stand for one day
The next day record the final mass and circumference
Gather class data
Interpret observations, draw conclusions
Do Now:
Pick up a copy of the
notes by the front door
How are diffusion and
osmosis similar?
Conclusions
OSMOSIS
THE DIFFUSION OF WATER!
Keeping water balance
 Cell survival depends on balancing water
uptake & water loss
freshwater
balanced
saltwater
1
Keeping right amount of water in cell
 Freshwater
freshwater
KABOOM!
 a cell in fresh water
 high concentration of water
around cell
 cell gains water
 example: Paramecium
 problem: cells gain water,
swell & can burst
 water continually enters
Paramecium cell
 solution: contractile vacuole
 pumps water out of cell
No problem,
here
2
Keeping right amount of water in cell
 Saltwater
I’m shrinking,
I’m shrinking!
 a cell in salt water
 low concentration of
water around cell
 cell loses water
 example: shellfish
 problem: cell loses water
I will
survive!
 in plants: plasmolysis
 in animals: shrinking cell
 solution: take up water
saltwater
3
Keeping right amount of water in cell
 Balanced conditions
balanced
 no difference in
That’s
better!
concentration of water
between cell & environment
 cell in equilibrium
 example: blood
 problem: none
 water flows across
membrane equally,
in both directions
 volume of cell doesn’t
change
I could
be better…
Controlling water
 Contractile vacuole in Paramecium
What happens when an organism is placed
in a 10% salt solution … draw the osmotic
situation ….
Osmosis Practice
 Pogil – Transport in cells model 2
 SKIP NUMBERS
 16 B, C
 17 B, C
 20, 22
 TURN IN WHEN FINISHED
 OR COMPLETE FOR HOMEWORK!
Do Now:
 Draw the diagram on a
Outside:
95% Water, 5% Salt
sheet of loose leaf.
 Then identify the following:
 Area of high concentration
 Area of low concentration
 Which way is water moving?
 What is the term used to
describe this scenario?
(hypertonic, isotonic, or
hypotonic)
 What will physically happen
to the cell?
Inside:
90% Water
5% Salt
Good Morning 
Do Now:
Pick up notes and review packet
from door.
Take out POGIL from yesterday.
WRITE: Is it possible to die from
drinking too much water? Why or
why not?
Passive Transport
Facilitated Diffusion
What does it mean “to facilitate”?
Facilitated Diffusion
 A form of passive transport
 Requires NO energy!
 Items move from high concentration to
low concentration but are too big to
move between the phospholipids or
through membrane pores
 These molecules need the assistance of
protein channels
Passive Transport
Which is which?
 Diffusion
 Facilitated diffusion
 Osmosis
A. Diffusion of water from
high concentration to
low concentration
B. Movement of substances
from high concentration
to low concentration
C. Movement of molecules
through a membrane
through the assistance
of a carrier protein.
Molecules move from
high concentration to
low concentration.
What do all forms of passive
transport have in common?
NO ENERGY IS REQUIRED. Move
from high concentration to low!
 http://www.brainpop.com/science/cellularlifeandgenetics/passivetranspo
rt/
 http://www.brainpop.com/science/cellularlifeandgenetics/activetranspor
t/
Pogil
 Facilitated Diffusion
 Model 3
 Skip number 24
 Active transport
 Model 4
 Skip numbers 35-38
How do
LARGE
molecules
enter a cell?
Molecules that are too large can not fit
through the membrane proteins.
http://www.goldiesroom.org/Multimedia/Bio_Images/06%20Transport/02%20Molecul
es%20that%20are%20too%20big.gif
ACTIVE TRANSPORT
Actively using energy!
Active Transport
 You wouldn’t stop absorbing oxygen molecules just
because there are already SOME in the cell!
 Active transport requires the use of energy
 Moves molecules from an area of LOW concentration
to an area of HIGH concentration
 It’s uphill! It needs energy!
HIGH
LOW
Example of active transport
Active Transport
 Energy is also required to bring large
molecules inside of the cell and to
excrete wastes
 Endocytosis –
Exocytosis –
Endocytosis
Bringing stuff in (ENTER!)
Pinocytosis
 Membrane pinches
in pulling molecule
into a newly
formed vacuole
 Pino = PINCH!
Phagocytosis
 Membrane
extends out and
wraps around
molecule
creating a new
vacuole
http://www.goldiesroom.org/Multimedia/Bio_Images/06%20Transport/18%20Pinocytosis.gif
Endocytosis
Bringing stuff in (ENTER!)
Pinocytosis
Phagocytosis
 Membrane pinches
 Membrane extends
in pulling molecule
into a newly
formed vacuole
 Pino = PINCH!
out and wraps
around molecule
creating a new
vacuole
http://www.goldiesroom.org/Multimedia/Bio_Images/06%20Transport/17%20Phagocytosis.gif
Phagocytosis
 Pogil
 Summary:
http://www.brainpop.com/science/cellularlifeandgenetics/activetranspor
t/
Transport Summary
simple
diffusion
facilitated
diffusion
active
transport
ATP