observe the three pictures of red blood cells. 1) draw one cell of each picture and describe the...
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Observe the three pictures of red blood cells.
1) Draw one cell of each picture and describe the cells.
2) Predict: Which cells was placed in low, medium and high salt solution? Explain.
3) Conclude: Why is it important to have a specific salt concentration in the blood?
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Before:
Placed in hypotonic, hypertonic, Isotonic solutions.
To clarify:
After:
The inside and outside solutions are isotonic to one another.
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Plant cell??
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Suppose your dialysis tubing is replaced with a living fish… 1.What would happen to this fish if you placed it in tap or even in distilled water?2.What would happen to this fish if you placed it in salt water?3.So, how do some fish live in freshwater, or in saltwater?
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Passive and Active Transport
Across the Cell Membrane
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From Paramecium to Facilitated Diffusion
Two Molecules thick membrane
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Passive Transport
Transport that doesn’t use cell energy.
Molecules flow down their concentration gradient.
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Cell Membrane, Passive Transport, wandering molecules
1.Simple Diffusion Example: Water , oxygen2. Facilitated DiffusionExample: Glucose, Ions
Passive Transport
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Passive Transport
Channels by Stolaf
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Glucose cannot pass through
Passive Active Transport!Glucose
Osmosis
EQUILIBRIUM
Diffusion:
Channels by Stolaf
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Glucose Channels open in response to the hormone Insulin
Facilitated Diffusion
Tutorial: Passive and Active Transport
Glucose TransporterEQUILIBRIUM
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Lets compare:1. Diffusion (of oxygen, for
exmaple)
2. Osmosis
3. Facilitated Diffusion
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Comparing In terms of:
Diffusion
Facilitated Diffusion
Osmosis
H2O
O2…
oC
1.Direction 2.Energy Source3. What’s moving? 4.Protein?
Notes
+-Glucose
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Copy and Identify:1.Which is going down, which up the concentration gradient?2.Predict: where will the substance go, by passive transport? Explain
B.A.
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Active Transport
Transport that requires cell energy. Notes
Transport that pushes ions up / against their concentration gradient.
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1. Pumps (Charged Ions)2. Endocytosis (Large particles)3. Exocytosis (Large particles)
Active Transport
Ion Pumps – ATP Antiport
Ion Pumps -
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Ion Pumps
Maintain a membrane potential with a more
negative ions inside and more positive ions outside.
Active Transport Animation Tutorial
Transport Animation (password)
Na/K pump simple animation
Pumps - by Stolaf
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Endocytosis
Endocytosis of LDLPhagocytosis Simplified
Endocytosis
White Blood Cell Chases Bacteria
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Identify: Passive, active transport, pumps and channels.
B.A.
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Try yourself - Active or Passive?
Diffusion Channel
SymportSymportAntiport
Osmosis
Transport Animation (and more!)
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Contractile vacuole Movie
A living cell is put into a surrounding of 100% pure water (most hypotonic!!) –
1.Where would the water go? 2. What would be the problem for the cell?
3. How might the cell solve it?
J.
Contractile Vacuole UC DavisContractile Vacuole new
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Video: Part Two
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Raise The Correct Note in response to the following slides:
Passive Transport: Blue
Active Transport: Red
Both: Blue and Red
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1. Going from Low to High concentration
2. Uses ATP as source of (cellular) energy
3. Small, uncharged substances
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4. Proteins are involved
5. Going from High to Low concentrations
6. Ion Channels and Glucose Transporter
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7. Ion Pumps
8. Uses Heat as the source of (kinetic) energy9. Osmosis is an example of….
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10. Charged substances (ions).
11. Endocytosis / Exosytosis
12. Demonstrated by dialysis tubing
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13. ATP
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14.
ATP
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15.
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16.
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17.
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18. Oxygen Diffusion into cells
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19.
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20. Demonstrated by the decalcified egg experiment
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21.
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15.
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16.
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ATP
17.
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19.
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Transport of Proteins Inside the Cell: Vesicular Transport
Protein Transport - ER and Golgi
Problem: How do we get a new protein from the center of the cell to the membrane?
NSolution: Vesicular Transport
?
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A.Endocytosis: Purpose is to take in liquids or a large particle, as a signal for the cell.
B. Exocytosis: Purpose is to release a large molecule from the cell, to get rid of waste or to release a signal protein.
Answer to journal:
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The cell membrane is said to be Selective and Semi-permeable.(or ‘selectively permeable’)
Write at least three facts you learned that support this idea.
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Consider a certain concentration of salt in water.This solution can be both hypotonic and hypertonic at the same time.
How is this possible?!
Hypo-tonic
to
Hyper-tonic
to
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Desalination Plant.
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1. Water flows in from the estuary or sea 2. Salt water contains sodium and chloride ions3. Pressure is applied to force salt water through membrane4. Semi-permeable membrane with millions of microscopic holes 5. Clean water fit for drinking6. Saline concentrate flows out
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You have just learned that water moves from lower to higher solute concentration.1.How is it possible to drive water in the opposite direction? Give an example.2. Active transport – uses consumed energy. Passive transport – does not. What is desalination, then?