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Transport in cells

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?.

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Transport in cells

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  1. 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 • http://www.brainpop.com/science/matterandchemistry/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 http://www.brainpop.com//science/matterandchemistry/diffusion/quiz/

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

  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 • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html

  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 • http://www.brainpop.com/science/cellularlifeandgenetics/passivetransport/

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

  20. 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

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

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

  23. 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

  24. Active transport • Energy in a cell is known as ATP

  25. Active transport • http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/preview.weml

  26. Active vs. Passive

  27. 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.

  28. 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.

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

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