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Selectively Permeable Membrane to choose to pass through thin outer boundary
Gate keeper for friendly folks but not enemies
A ?
B ?
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Membrane is permeable to:
H2O
O2
CO2
Membrane is NOT permeable to:
NaCl2
Macromolecules (potassium,Calcium, sodium)
Then how do these important substances move in and out of the cell membrane?
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They move in & out of the membrane by one of these ways:
1-diffusionpassive transport
2- osmosis
3- transport proteinactive transport
4- engulfing
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What is Diffusion?Molecules tend to move from an area of higher
concentration to an area of lower concentration.
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How do these paramecium get the oxygen they need to survive from the water around them?
More oxygen in water than inside their cell so it diffuses from high to low concentration.
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What is OSMOSIS?-diffusion of water molecules through a selectively permeable membrane
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Diffusion and Osmosis are considered Passive Transport.
H2OO2CO2
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Passive Transport-no energy needed, just equilibrium.
Diffusion & Osmosis
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If Passive transport doesn’t use energy then what about Active transport?
NaCl2CalciumPotassiumSodium
Bigger molecules need energy to get in
Transport protein
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What do you think this cool Active transport is called?
ENGULFING !!!
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Match these:1. Permeable A. Thin outer boundary2. Osmosis B. Spreading out of particles3. Membrane C. To choose4. Diffusion D. Amoeba seeking food5. Active Transport E. No energy needed6. Selectively F. To pass through7. Passive Transport G. Revolving door using
energy8. Transport Protein H. Water moving across a
membrane9. Engulfing I. Energy needed to scooter
uphill