1. Looking at Cells Bell Work:9/17/14
Complete the Warm up sheet- Use your notes or Science book.

2. Objectives
Explain how materials move through simple diffusion. (SPI )
Diffusion/Osmosis Demo & Notes

3. Discuss the questions with your Elbow Partner.
Challenge Question?
What cell organelle allows things to move in and out of the cell?
What things are allowed in and out of the cell?
Discuss the questions with your Elbow Partner.

4. Teacher Demo
Soap bubbles have properties, such as flexibility, that are similar to cell membranes.
Components of soap film and of cell membranes move around freely because they are made of proteins and lipids (fats).

5. What is Diffusion?
The movement of particles from regions or areas of _________ concentration (crowded) to areas of ________ concentration (less crowded) is called ____________.
Teacher Demo:
The dye moved from an area of high concentration and spread to the area of low concentration.
Ex: when oxygen diffuses into the cell and carbon dioxide diffuses out.
high
low
diffusion

6. Diffusion of Water
Diffusion also happens with and between living cells.
The cells of organisms are surrounded by and filled with fluids that are made mostly of ________.
The diffusion of water through a _____________ (partially allows things through) membrane is so important that it has been given a special name- __________.
water
semipermeable
osmosis

7. Question...Elbow Partner
In diffusion and osmosis, why do the particles move from areas that are more crowded to areas that are less crowded?
For a cell to survive, the amount of molecules need to be the same on both sides of the cell membrane. If the cell does not pump out all of its extras to even things out, this could be very bad. The cell can swell up and explode.

8. Moving Small Particles
In a cell, the movement of particles across a cell membrane _________ the use of energy by the cell is called __________ ___________.
During passive transport, particles move from an area of _______ concentration to an area of _______ concentration.
Examples:__________ & __________
A process of transporting particles that requires the cell to use energy is called ________ ____________.
Active transport usually involves the movement of particles from an area of _______ concentration to an area of _______ concentration.
without
passive
transport
high
low
Diffusion
Osmosis
active
transport
low
high

9. Moving Large Particles
The active transport by which a cell surrounds a large particle, such as a large _________, and encloses the particle in a vesicle to bring the particle into the cell is called _______________.
Vesicles are _____ formed from pieces of cell membrane.
Ex: when iron diffuses into the cell using active transport because the iron molecules are too large.
When large particles, such as ________, leave the cell, the cell uses an active transport called ______________.
During exocytosis, a vesicle forms around the large particle, carries the particle to the cell membrane, fuses with the cell membrane, and releases the particle outside of the cell.
protein
endocytosis
sacs
wastes
exocytosis

10. What do you know? (Einstein Award Opportunity)
Describe how each of the following materials would get through the cell membrane and into a cell:
Pure water
Sugar entering a cell that already contains a high concentration of particles
Sugar entering a cell that has a low concentration of particles
A protein
(osmosis)
(active transport)
(passive transport)
(endocytosis)

11. BRAINPOP!!!