how do materials move in & out of the cell? they move across the cell membrane by: passive...
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How do Materials move in & out of the Cell?
They move across the cell membrane by:
Passive Transport (no energy required) or
Active Transport (energy required)
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Passive Transport
• How materials move across a Cell Membrane.
• NO Energy required• Materials always move from a HIGH
to a LOW CONCENTRATION until equal!
• Or from a more crowded area to a less crowded area to achieve a balance
(JUST RIGHT).
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2 Types of Passive Transport
•Diffusion
•Osmosis
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Selectively Permeable Membrane
• The cell membrane controls what can enter the cell as well as what can leave the cell.
• Pink & Purple Polk-a-Dotted Pastel Easter Sweater
Lipid Bilayer = Cell Membrane
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SEMI-PERMABLE MEMBRANE
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DIFFUSION EXAMPLE 1• The movement of material from a
HIGH concentration to a LOW concentration until EQUAL.
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DIFFUSION EXAMPLE 2
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DIFFUSION EXAMPLE 3High concentration or CROWDED
Low Concentration or NOT Crowded
14 dots
14 dots
JUST RIGHT!
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DIFFUSION EXAMPLE 4
JUST RIGHT
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OSMOSIS EXAMPLE 1• Osmosis is the movement of WATER
MOLECULES from area of HIGH Water Concentration to area of LOW Water Concentration!
Why don’t the SUGAR molecules diffuse???
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OSMOSIS EXAMPLE 2
Urea low Urea highWater highWater low
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OSMOSIS EXAMPLE 3
Low Water concentration inside the blood cell!
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OSMOSIS EXAMPLE 4
Water molecules Sugar molecules
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OSMOSIS EXAMPLE 5
Why don’t the salt molecules (red circles) diffuse across the membrane?
SALT SUCKS!!!
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Osmosis in Plant & Animal Cells
• 1. What do the plant & animal cells do when equal amounts of water moves into and out of the cell?
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Osmosis in Plant & Animal Cells
• What happens in Plant & Animal Cells when water diffuses out of the cell?
• (notice the plant cell’s vacuole)
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Osmosis in Plant & Animal Cells
• What happens in Plant & Animal Cells when water diffuses into the cell?
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OSMOSIS
Arrows show movement of WATER!