Transcript Passive & Active Transport

Passive & Active Transport
http://sps.k12.mo.us/chms/cmerrigan/cell
%20transport.htm
Animations!
Passive Transport
 What does it mean to be passive?
 Passive Transport – Movement across the cell
membrane that does not require energy
Cell Membranes
The Cell membrane is a PHSOPHOLIPID BI-Layer
What does that mean???
http://www.susanahalpine.com/anim/Life/memb.htm
http://www.wisconline.com/objects/index_tj.asp?objID=AP1101
Passive Transport
 Cody’s mother decided to cook them baked beans for dinner last
night. Cody decided to help himself to three serving of baked
beans. As we all know “Beans beans they’re good for your heart
the more you eat the more you ____”. Because of this Cody may
PASS gas today in class. If he does what would happen to the
people sitting around him? The next row? The back of the room?
Across the room?
Opener P___
 Explain the concept of diffusion through the forest
fires in Minnesota!
 How could diffusion be applied to cell membranes?
 Think about the structure of the cell membrane!
Diffusion
 Diffusion is the random movement of a substance from an area of
HIGH concentration to low concentration.
 concentration = amount
Diffusion explained
 Concentration Gradient – A difference in the
concentration of a substance
 Equilibrium – concentration (amount) is equal
throughout
 How do these 2 relate and explain diffusion?
Osmosis
 Osmosis is the DIFFUSION
of WATER across cellular
membranes
 Osmosis is a special case
of diffusion!
Hyper
Iso
Hypo
Hypertonic – Less water in the cell then
surrounding
Isotonic – Equal amount of water in and out
of the cell
Hypotonic – more water then surrounding
Observing Osmosis in Eggs
 Every lab needs:
Left Side Page___
 Create three Haikus for solutions dealing with transport.
 Hyper, Hypo and Iso
Opener P__
 Draw three cells in three beakers:
 The first cell is in a Hypertonic Solution
 The second cell is in a Isotonic solution
 The third cell is in a Hypotonic solution
 Be sure to include the direction that the water moves.
Diffusion Applications!
It prevents
them
from
wilting
to dehydration
OSMOSIS
1. Why
are
leafy
greendue
vegetables
sprayed-with
water
at the supermarket?
Salt creates
a is
HYPERTONIC
solutionfood?
– This shrinks the
2. Why
salt used to preserve
organisms so they die
3. Why should you not drink sea water?
There are MANY SOLUTES ( molecules ) in salt water – This
creates a HYPERTONIC solution DEHYDRATING your body!
Elodea
With Water
With Salt
Solution
Osmosis
 Osmosis is the DIFFUSION
of WATER across cellular
membranes
 Osmosis is a special case
of diffusion!
Diffusion Through Ion Channels
 An ION is a CHARGED particle
 IONS carry messages. They need to get into the cell to pass on the
message.
 There needs to be a CHANNEL for the ION to pass through
Facilitated Diffusion
FACilitated Diffusion – Diffusion with HELP!
The FACulty helps students
1 - A molecule outside the
cell
binds to a carrier protein on
the cell membrane.
2 - The carrier protein
transports
the molecule across
the cell membrane.
3 -The
molecule is
released
from the
carrier protein
inside the cell.
Passive Transport skits!
 Diffusion!
 You must show
 High
Concentration to
Low
concentration
 Osmosis
 You must show
 Hyper, Hypo & Iso
tonic solutions
• Facilitated
Diffusion
– You must
show
– How the
diffusion is
FACILITATED!
Diffusion Website
 http://www.northland.cc.
mn.us/biology/BIOLOGY11
11/animations/passive1.sw
f
 Lewis Thomas
Supplemental reading?
 COLIN ZAIO OWES US
CANDY!!!!
 ANY REQUEST?!?!?!?!?!?!
Active Transport!
 Must Knows for Active
Transport!
1. Compare and Contrast Passive
 What did it mean to have
and Active Transport.
ACTIVE transport? What
– P _____
made it ACTIVE!
2. Explain how a Sodium Potassium pump works.
–
P_____
3. Distinguish between
endocytosis and exocytosis

P____
Sodium & Potassium Pumps
 Sodium Potassium pumps ACTIVELY pump Sodium &
Potassium AGAINST their concentration gradients!
Four Parts to Na, K Pumps!
1.
Three sodium ions go into
“pump”
ATP binds to protein
channel to “open”
gate
2. The “pump” changes
shape, pushing three
sodium ions outside of
cell
3. Two Potassium
ions move into
pump
4. Potassium Ions
are released
inside of cell
Vesicle Movement
ENDOcytosis
 ENDO = in
 Endocytosis is the movement
of a substance INTO a cell
EXOcytosis
 EXO = out
 Exocytosis is the movement of
a substance OUT of a cell
Active Transport
 Describe Passive transport in TWO sentences!
 How did we compare Passive & Active Transport?