Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis
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Day 14 DO NOW: What happens when you put salt on a slug or a snail? AIM: What is Osmosis? PowerPoint PPT Presentation


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Day 14 DO NOW: What happens when you put salt on a slug or a snail? AIM: What is Osmosis?. http://www.youtube.com/watch?v=PiQkebrCw8U. 20 Salt 20 water. 20 Salt 10 water. 10 Salt 20 Water. 10 Salt 10 Water. What is osmosis?. Osmosis is the diffusion of water through a membrane.

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Day 14 DO NOW: What happens when you put salt on a slug or a snail? AIM: What is Osmosis?

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Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

Day 14DO NOW: What happens when you put salt on a slug or a snail?AIM: What is Osmosis?


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

http://www.youtube.com/watch?v=PiQkebrCw8U


What is osmosis

20 Salt

20 water

20 Salt

10 water

10 Salt

20 Water

10 Salt

10 Water

What is osmosis?

  • Osmosis is the diffusion of water through a membrane.

  • Like regular diffusion, water will move from one concentration to another until both sides are equal in concentration


How is osmosis different than diffusion

How is osmosis different than diffusion?

  • In diffusion, the solute (the dissolved material) moves from a high concentration to a low concentration.

  • Remember that the solute is small molecules such as glucose, fatty acids, amino acids, oxygen, carbon dioxide and water.

  • But because some molecules are too big to get across the membrane, water has to move in toward these large molecules in order to dilute the concentration.


What are the effects of osmosis a

What are the effects of osmosis? (a)

  • If the concentration of water inside the cell and outside the cell is the same, there is no net osmosis occurs.

Water goes in

Water goes out


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

What are the effects of osmosis? (b)

  • If the concentration of water is higher outside the cell then inside the cell, the water outside the cell will move inside the cell.

Pop!!

Water goes in (only)


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

What are the effects of osmosis? (c)

  • If the concentration of water is higher inside the cell then outside the cell, the water inside the cell will move outside the cell.

Water comes out (only)

Salt sucks the water out of the cell


How does osmosis affect plant cells

How does osmosis affect plant cells?

  • All cells goes through osmosis.

  • Because plant cells have a cell wall surrounding it, the cell looks differently when osmosis occurs.


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

If the plant cell is placed in a solution of high concentration of solute……

then the water will leave the cell causing the cytoplasm to shrink.

The cell wall remains the same!!


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

If the plant cell is placed in a solution of low concentration of solute……

then the water will enter the cell causing the cytoplasm to swell.

The cell wall begins to swell, deforming the shape!!


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

  • http://www.youtube.com/watch?v=rvIh8JvyaYA


Day 15 what is passive and active transport

DO NOW: How would you define someone who is active? ____________________

How would you define someone who is passive? ___________________________

Day 15What is Passive and Active Transport?


There are 2 ways molecules can get in a cell

There are 2 ways molecules can get in a cell.

  • 1) Passive Transport – This type of transport requires no energy (no ATP). The cell uses the natural process of different concentration and molecule size to help molecules move from one area to another.


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

Energy (ATP)

How to Remember Passive Transport

Greater Concentration

Examples:

Diffusion

Osmosis

Lesser Concentration


There are 2 ways molecules can get in a cell cont

There are 2 ways molecules can get in a cell. (cont)

  • 2) Active Transport – This type of transport requires energy (ATP) to move molecules across the membrane. Some molecules must go against the concentration grain, therefore they rely on protein “pumps”. To get them across.


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

Need Energy (ATP)

How to Remember Active Transport

Active transport that requires energy. Movement molecules from low concentration to high.

Greater Concentration

Lesser Concentration


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

Other Type of Active Transport

  • Phagocytosis- Movement of large material into the cell. Cell “pinches” the membrane forming a “bubble” around the large material.


Day 14 do now what happens when you put salt on a slug or a snail aim what is osmosis

Why is Cellular Transport Important?

  • Cells need materials in order to carry out the 8 life functions

  • Cells need O2 and glucose to perform respiration

  • Cells need to get rid of waste products (CO2 & excess water)

  • Cells need to grow and repair itself

  • Cells need molecules to break apart and recombine to make new molecules.

  • Without cellular transport, cells could not do what they do.


Red onion in tap water

Red Onion in tap water


Red onion in distilled water starting to rehydrate

Red Onion in distilled water starting to rehydrate


Red onion eventually goes back

Red Onion eventually goes back


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