cellular transport how your cells eat, drink and be merry! eq: describe the structure of the cell...
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Cellular Transport
How Your Cells Eat, Drink and be Merry!
EQ: Describe the structure of the cell membrane.
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lipids
lipids
proteinsproteins
Which two major organic compounds were found in cell membranes?
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How do nutrients and water get into cells?
cell membrane
Channel Protein
Cell
Membrane
Lipid
Outside of Cell
Inside of Cell
Marker Protein
ReceptorProtein
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You eat and drink so that your cells can eat and drink!
• Cells must take in water and nutrients in order to maintain HOMEOSTASIS
Mmm…..
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Oil (lipid) and water don’t mix – thank goodness!
• Water is essential for life!
• Every cell in your body is “swimming” in a solution with a very high water concentration.
• The lipid (oily) layer around cell maintains the cell as a unit, making sure it doesn’t dissolve away.
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What is the cell
membrane made of? • Proteins and Lipids
lipid bilayer: two layers of lipids with proteins scattered through it
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Cell Membrane Proteins
Receptor: receive chemical messages
Channel: allow things in and out
Marker: identify the cell
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Substances are TRANSPORTED into and out of cells across the cell membrane
• Two Types of Transport:–Passive–Active
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What is Passive Transport?
1. Requires no energy from cell.
2. Molecules move from high concentration to low concentration.
3. Molecules move with the concentration gradient.
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Diffusion: when substances move from high to low concentrations in
order to reach equilibrium
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Diffusion through a cell membrane
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Osmosis: when WATER moves from high to low concentration in order to reach equilibrium (a type of diffusion)
Cell Membrane
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How are these big guys going
to get across? I’m a Channel, I can help!
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Explain what is happening
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There are 3 types of passive transport:
1. diffusion
2. osmosis
3. facilitated diffusion
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What is the movement of water called?
Word from unit
Picture
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How is Active Transport different?
1. Active transport requires energy.
1. Solutes move from low concentration to high concentration
1. Molecules move against concentration gradient.
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Cell Pumps: Active Transport
• The sodium-potassium pump is a classic example of a cell using active transport to move substances against the concentration gradient.
• It is vital in proper functioning of nerve cells.
Click on the diagram to see an animation of a potassium-sodium pump at work. On the website, scroll down to see the animation. It can be slowed down or stopped at will.
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FormFood
Vacuole
LysosomesCome ToVacuole
Digestion
• Your white bloods cells also do this.• This is the ingestion of large particles
using energy.• Is it active or passive transport?
TrapFood
Amoeba
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Amoeba engulfing a protist.
• White blood cells engulf bacteria and viruses in the same way.
• Is this active or passive transport?
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Cellular Transport cont.
EQ: How can you decide if a solution is hypertonic, hypotonic, or isotonic?
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Hypertonic Solution• Greater amount of solutes
(dissolved substances) in the solution compared to the cell.
70% Water30% Solutes
20% solute
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Hypotonic Solution
• Fewer solutes (dissolved substances) in the solution as compared to the cell.
100% Water
0% solutes
20% solutes
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Isotonic Solution• Same amount of solutes inside
and outside the cell.
80% Water20% Solutes
80% H2O
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Remember the potato lab????
What type of solution was the saltwater solution?
The water?