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