Transport in cells
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Transcript of Transport in cells
Bell ringer: How do things get in an out of a cell?
TRANSPORT IN CELLS
Observe the balloon on your table. Write down what you notice about these balloons. Remember, observations use ALL senses.
BALLOON OBSERVATIONS
How could you smell what was inside the balloon?
BALLOON OBSERVATIONS
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?
CELL MEMBRANE
Water
Oxygen
Carbon Dioxide
Waste
THINGS THAT A CELL NEEDS
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.
DIFFUSION
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
CONCENTRATION GRADIENT
Molecules move from areas where there are LOTS to LITTLE
They want to spread out!
DIFFUSION
http://www.brainpop.com/science/matterandchemistry/diffusion/
Why can you smell someone’s perfume from across the room?
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?
DIFFUSION
With your neighbor, discuss why the potatoes looked different.
THINK-PAIR-SHARE
http://www.brainpop.com//science/matterandchemistry/diffusion/quiz/
REVIEW
Bell Ringer: Think of a real-life situation where diffusion occurs.
PASSIVE TRANSPORT
http://www.youtube.com/watch?v=0c8acUE9Itw&feature=related
Osmosis is the diffusion of water
OSMOSIS
What happens when something is too big to get through the membrane?
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.
FACILITATED DIFFUSION
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html
FACILITATED DIFFUSION
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
http://www.brainpop.com/science/cellularlifeandgenetics/passivetransport/
PASSIVE TRANSPORT
Osmosis
DiffusionFacilitated Diffusion
Bell ringer: What are the three kinds of passive transport we have already learned? What do they have in common?
ACTIVE 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
REVIEW
http://www.youtube.com/watch?v=yZ15vCGuvH0
Our muscles use something called ACTIVE TRANSPORT!
MUSCLES!
Sometimes, a cell wants to move something from a low concentration to a high concentration.
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
ACTIVE TRANSPORT
Energy in a cell is known as ATP
ACTIVE TRANSPORT
http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/preview.weml
ACTIVE TRANSPORT
ACTIVE VS. PASSIVE
Active Passive
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.
QUICK WRITE
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.
AGREE OR DISAGREE
Questions 1-6 on the worksheet due tomorrow!
HOMEWORK