TRANSPORT IN CELLS Bell ringer: How do things get in an out of a cell?
BALLOON OBSERVATIONS 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? 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? THINGS THAT A CELL NEEDS Water Oxygen
Carbon Dioxide Waste DIFFUSION Things that are small enough can go across the cell membrane without help or trouble. They dont use any energy.
What makes them move then? In diffusion, molecules go from areas of HIGH concentration, to areas of LOW concentration. Lets try it. 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 DIFFUSION 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 someones 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? THINK-PAIR-SHARE With your neighbor, discuss why the potatoes looked different. REVIEW
http://www.brainpop.com//science/matterandchemistry/ diffusion/quiz / PASSIVE TRANSPORT Bell
Ringer: Think of a real-life situation where diffusion occurs.
OSMOSIS http:// www.youtube.com/watch?v=0c8acUE9Itw&feature=rel ated Osmosis is the diffusion of water
FACILITATED DIFFUSION 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 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 http://www.brainpop.com/science/ cellularlifeandgenetics/passivetransport/ Osmosis Facilitated Diffusion
Diffusion ACTIVE TRANSPORT Bell ringer:
What are the three kinds of passive transport we have already
learned? What do they have in common? 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 MUSCLES! http://www.youtube.com/watch?v=yZ15vCGuvH0
Our muscles use something called ACTIVE TRANSPORT! ACTIVE TRANSPORT 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/act
ivetransport/preview.weml ACTIVE VS. PASSIVE Active Passive
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.
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.
HOMEWORK Questions 1-6 on the worksheet due tomorrow!
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