1. Bell ringer: How do things get in an out of a cell?
Transport in cells
Bell ringer: How do things get in an out of a cell?

2. Balloon Observations
Observe the balloon on your table. Write down what you notice about these balloons. Remember, observations use ALL senses. 

3. Balloon Observations
How could you smell what was inside the balloon?

4. Cell membrane
The cell membrane is responsible for making sure certain things cannot get in, while others can
Some things are small and ALWAYS needing to go in and out. Just like the balloon, the cell membrane allows some things to come and go.
Can you think of things that are small and the cell needs constantly?

5. Things that a cell needs
Water
Oxygen
Carbon Dioxide
Waste

6. Diffusion
Things that are small enough can go across the cell membrane without help or trouble. They don’t use any energy.
What makes them move then? In diffusion, molecules go from areas of HIGH concentration, to areas of LOW concentration.
Let’s try it.

7. Concentration gradient
Molecules move from areas of high concentrations to low concentrations.
A concentration gradient is a change of how much of something there is over a space

8. Diffusion Molecules move from areas where there are LOTS to LITTLE
They want to spread out!

9. diffusion
Why can you smell someone’s perfume from across the room?

10. Diffusion
Earlier today I placed a normal piece of potato in two different liquids: water and salt water.
Potatoes have a lot of water in their cells.
What do you think will happen to the water in the potato cells in each of these liquids?

11. Think-Pair-Share
With your neighbor, discuss why the potatoes looked different.

12. Review

13. Bell Ringer: Think of a real-life situation where diffusion occurs.
Passive Transport

14. Osmosis http://www.youtube.com/watch?v=0c8acUE9Itw&feature=related
Osmosis is the diffusion of water

15. Facilitated Diffusion
What happens when something is too big to get through the membrane?

16. Facilitated Diffusion
The molecule might need a little help getting through the membrane.
Certain proteins can help the molecule get into the cell and still go along the concentration gradient.
Since no energy is used, this is diffusion. But since the molecule needs help (or facilitation) it is called facilitated diffusion.

17. Facilitated Diffusion

18. Passive Transport
Whenever a cell uses NO ENERGY to move something it is called passive transport.
Thus far, we know 3 kinds of passive transport: diffusion, facilitated diffusion and osmosis

19. Facilitated Diffusion
Osmosis
Diffusion
Facilitated Diffusion

20. Bell ringer: What are the three kinds of passive transport we have already learned? What do they have in common?
Active transport

21. Review
Whenever a cell uses NO ENERGY to move something it is called passive transport.
Thus far, we know 3 kinds of passive transport: diffusion, facilitated diffusion and osmosis

22. Muscles! http://www.youtube.com/watch?v=yZ15vCGuvH0
Our muscles use something called ACTIVE TRANSPORT!

23. Active transport
Sometimes, a cell wants to move something from a low concentration to a high concentration.

24. Active transport
Some examples of this include: moving ions in muscles, moving sugar into a cell, moving hormones into or out of a cell
Whenever a cell moves something against the concentration gradient it must use energy
Active transport is transport that uses energy

25. Active transport
Energy in a cell is known as ATP

26. Active transport

27. Active vs. Passive
Active
Passive

28. Quick write
Explain how things move into and out of the cell with active transport. Use the following words in your explanation: energy (or ATP), concentration gradient, substance, cell membrane.

29. Agree or disagree Moving things into cell ALWAYS requires energy.
The cell membrane can control what goes in and out.
Diffusion uses no energy.
In active transport, things are pushed from an area of high concentration to low concentration.

30. Homework
Questions 1-6 on the worksheet due tomorrow!