Transcript Chapter 8-1: Cellular Transport

Chapter 8-1: Cellular
Transport
Osmosis
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Water wants to be equal on both
sides of the cell
Osmosis cont…
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Osmosis—diffusion (movement) of
water
Helps maintain homeostasis
Osmosis cont…
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Isotonic Solution
Water is equal on both sides of the cell
No water movement
Cells remains circular
Osmosis cont…
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Hypotonic solution
More water outside the cell than in
Water moves into the cell
Causes an increase in cell shape
Cell may burst
Hypotonic solution cont…
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Plant cells don’t burst
The plant becomes more firm
Grocers use this
Hypertonic Solution
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Less water outside the cell
Water moves out of the cell
Cells shrivel
Ex: Plants will wilt; Animals
become dehydrated
Passive Transport
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Movement into/out of cell using no
energy
Used to move water into/out of cell
Facilitated Diffusion
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Type of passive transport
No energy needed
Uses transport proteins to move
things into/out of cell
Ex: Food
Active Transport
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Movement of particles into/out of
cell using energy
Active Transport cont…
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Endocytosis
Take materials in
Active Transport cont…
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Exocytosis
Expel materials out
Ex: Wastes and Hormones