Transcript fluid mosaic model. active transport

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Moves molecules
from a LOW
concentration to a
HIGH concentration
Active Transport
And Proteins Involved
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Active Transport
 Requires
Energy
 Transport
of molecules
or ions against its
concentration gradient
 Molecules
moving
from low to high
concentration
 energy
ATP
source used is
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Carrier Pumps
 Same
function as a carrier protein, except it moves
ions against its concentration gradient
 Low
to high concentration = requires energy
 Example: Na+/K+
pump
3 Na+ ions are pumped outside the cell: higher [Na+]
 2 K+ ions are pumped inside the cell: higher [K+]
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udent_view0/chapter2/animation__how_the_sodium_p
otassium_pump_works.html
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Importance of Na+/K+ Pump
Disease that can result
 Mutation
or non functional protein can lead to
dystonia parkinsonism
 Involuntary, sustained
 Tremors, slow
muscle contractions
& painful movement, shuffle walk
with consistent falling.
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Importance of Na+/K+ Pump
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Neurons use the Na+/K+ Pump to
communicate and send signals to each
other.
Example:
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Stick hand in flame of a candle.
Neurons in finger cannot communicate
pain to brain.
 Result: 3rd
degree burns on hand
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Endocytosis
 Defined: movement
of a substance
INTO the cell by a
vesicle
 Vesicle: small
sac
that contains
materials
 Made of
phospholipids
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Exocytosis
 Defined: movement
the cell by a vesicle
of a molecule OUT of