passive & active transport %20transport.htm animations!
TRANSCRIPT
Passive & Active Transporthttp://sps.k12.mo.us/chms/cmerrigan/cell%20transport.htm
Animations!
What does it mean to be passive?
Passive Transport – Movement across the cell membrane that does not require energy
Passive Transport
The Cell membrane is a PHSOPHOLIPID BI-LayerWhat does that mean???
http://www.susanahalpine.com/anim/Life/memb.htm
http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101
Cell Membranes
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?
Passive Transport
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!
Opener P___
Diffusion is the random movement of a substance from
an area of HIGH concentration to low concentration. concentration = amount
Diffusion
Concentration Gradient – A difference in the concentration of a substance
Equilibrium – concentration (amount) is equal throughout
How do these 2 relate and explain diffusion?
Diffusion explained
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 cellHypotonic – 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
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.
Opener P__
1. Why are leafy green vegetables sprayed with water at the supermarket?
2. Why is salt used to preserve food?
3. Why should you not drink sea water?
Diffusion Applications!
It prevents them from wilting due to dehydration - OSMOSIS
Salt creates a HYPERTONIC solution – This shrinks the organisms so they die
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!
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
Diffusion Through Ion Channels
Facilitated Diffusion
1 - A molecule outside the cell
binds to a carrier protein onthe cell membrane.
2 - The carrier protein transports
the molecule acrossthe cell membrane.
3 -The molecule is releasedfrom the carrier proteininside the cell.
FACilitated Diffusion – Diffusion with HELP!
The FACulty helps students
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/BIOLOGY1111/animations/passive1.swf
Lewis Thomas Supplemental reading?
COLIN ZAIO OWES US CANDY!!!!
ANY REQUEST?!?!?!?!?!?!
Active Transport!
What did it mean to have ACTIVE transport? What made it ACTIVE!
Must Knows for Active Transport!
1.Compare and Contrast Passive and Active Transport.
– P _____
2.Explain how a Sodium - Potassium pump works.
– P_____
3.Distinguish between endocytosis and exocytosis P____
ENERGY!
Sodium Potassium pumps ACTIVELY pump Sodium & Potassium AGAINST their concentration gradients!
Sodium & Potassium Pumps
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
Describe Passive transport in TWO sentences!
How did we compare Passive & Active Transport?
Active Transport