Transport in cells
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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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Transport in cells

Transport in cells

Bell ringer: How do things get in an out of a cell?


Balloon observations

Balloon Observations

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


Balloon observations1

Balloon Observations

  • How could you smell what was inside the balloon?


Cell membrane

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

Things that a cell needs

  • Water

  • Oxygen

  • Carbon Dioxide

  • Waste


Diffusion

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.


Concentration gradient

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


Diffusion1

Diffusion

  • Molecules move from areas where there are LOTS to LITTLE

  • They want to spread out!


Diffusion2

diffusion

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

  • Why can you smell someone’s perfume from across the room?


Diffusion3

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

Think-Pair-Share

  • With your neighbor, discuss why the potatoes looked different.


Review

Review

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


Passive transport

Passive Transport

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


Osmosis

Osmosis

  • http://www.youtube.com/watch?v=0c8acUE9Itw&feature=related

  • Osmosis is the diffusion of water


Facilitated diffusion

Facilitated Diffusion

  • What happens when something is too big to get through the membrane?


Facilitated diffusion1

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 diffusion2

Facilitated Diffusion

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


Passive transport1

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/


Active transport

Active transport

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


Review1

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

Muscles!

  • http://www.youtube.com/watch?v=yZ15vCGuvH0

  • Our muscles use something called ACTIVE TRANSPORT!


Active transport1

Active transport

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


Active transport2

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 transport3

Active transport

  • Energy in a cell is known as ATP


Active transport4

Active transport

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


Active vs passive

Active vs. Passive


Quick write

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

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

Homework

  • Questions 1-6 on the worksheet due tomorrow!


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