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Transcript
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?