Transport in the Cell
Active and Passive Transport
-You and your partner will
take notes on the note guide
about transport. You will also
watch videos to help you
understand the information.
How can molecules move through
cells?
• Semi-permeable membrane: allows
certain molecules to move in or out
depending on their properties
– Ex: if they are too big, they can’t go in easily
• Membrane is made of (composition):
– Bi-lipid layer
• 2 layers of lipids
– Proteins that transport materials across
– Carbohydrates that act as identifiers
Before we begin you must
understand….
• Concentration-how much solute is
in a solvent
• Why must molecules move?
– To maintain homeostasis
– Homeostasis-state of balance in which
the internal body remains in a normal
range
– Molecules must move to maintain this
Fill out your noteguide for
passive and active
transport.
2 types of transport in the cell
• Passive transport
– Molecules move down
the concentration
gradient
• Area where there is a
lot of molecules to
where there is very
little
– Energy involved: NO
• Active transport
– Molecules move up the
concentration gradient
• Area where there is a
few molecules to
where there is a lot
– Energy involved: YES
Go to the following website and log in.
Then return to the next slide of the
power point for the specific URL
• Go to www.brainpop.com
• Log in using:
• Username: cvbrainpop
• Password: cheetah1
Movie time: copy and
paste this URL in the brain
pop tab.
• http://www.brainpop.com/science/
cellularlifeandgenetics/passivetrans
port/
Username: cvbrainpop
Password: cheetah1
Next up is the types of
passive transport.
Take notes on diffusion and osmosis
on your worksheet.
-Make sure to include if it is active or
passive transport.
Type of Passive Transport
Diffusion-movement of molecules
from an area of high concentration
to an area of low concentration until
equilibrium is reached
– Equilibrium-equal distribution
• Molecules will move equally after this is
reached.
– Simple molecules can move
• Carbon dioxide, oxygen
Passive transport
Osmosis-Type of passive
transport
• Water moves from an area of
high concentration to an area
of low concentration
– No energy involved
– AKA: diffusion of water
Copy and paste the URL
into the brain pop website.
http://www.brainpop.com/
science/matterandchemistr
y/diffusion/
Username: cvbrainpop
Password: cheetah1
Solutions
• Cells can be placed in different
solutions.
• These solutions can change the cell
in different ways.
• As you read, make note of what
happens to the cell in each solution
and why.
• Take notes in the Types of solutions
Hypertonic and Hypotonic
• Hypotonic-More water outside the cell than
inside
– Distilled water
– Water comes into the cell
– Why? To balance out the concentration of
solutes
• Hypertonic-More water inside the cell than
outside
– Salt water
– Water leaves the cell
– Why? to balance out the concentration of
solutes
Isotonic
• Molecules are equal inside and
outside the cell
– Molecules move evenly across the
membrane
• Take a look at the notes for turgor
pressure and plants.
• Put these notes on the back of the
wkst
• Draw a picture to show what is
going on.
Turgor Pressure and Plants
• Water fills the vacuole and the
contents of the cell are pushed
against the cell wall
• Produces turgor pressure
• Gives the plant rigidity and the
ability to stand erect
Next take notes on
facilitate diffusion.
Facilitated Diffusion-3rd
type of passive transport
• Molecules move from an area of high
concentration to an area of low
concentration with the help of a carrier
protein
– Molecules attach to a specific protein
– The protein allows it to move through the
membrane
– Needed when molecules are too big or have
an electrical charge (ions!!)
• Glucose (large molecules), Na+, Ca+, K+, Cl-
Add extra notes to
Active Transport if needed
• Requires energy from the
cell
• Move molecules from an
area of low concentration
to high
• The next slides are about the types of
active transport
Endocytosis
• Process for bringing things
into the cell
• Used for large particles
(bigger than molecules, still
microscopic)
• Requires energy
Phagocytosis
Pinocytosis
• “Cell Eating” • “Cell Drinking”
• Small bits of
• Very large
liquid or other
particles
substances
taken in by
taken in
cell (engulfed)
Exocytosis
• Process for moving large
amount of material out a cell
Check out this brain pop
Movie.
http://www.brainpop.com/
science/cellularlifeandgene
tics/activetransport/
Username: cvbrainpop
Password: cheetah1