2transport membran
TRANSCRIPT
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Transport aktif dan pasif
yang melewati membran sel
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Transport pasif
Tidak membutuhkan energi Adanya perpindahankarena perbedaankonsentrasi
Partikel bergerak dari
[HI] [LOW]
Contoh : di f fus ion,osmos is, faci l i tated
di f fus ion
Transport aktif
Memerlukan energi sel
Dapat pindah dari
konsentrasi rendah ke
konsentrasi tinggi
Melibatkan proteintransport yang bekerja
sebagai pompa
contoh: Exocytos is ,
endocyto s is , pinocytos is ,
phagocytos is
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Diffusion
Diffusion-perpindahan partikel dari area
yang mempunyai konsentrasi tinggi ke area
yang memiliki konsentrasi rendah
[HI] [LOW]
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The net flow of solute continues until equi l ibr iumis reached.
Solute continue to move across the membrane, but for everyone that moves in one direction, another moves in the oppositedirection, so there is no net movement.
[HI] [LOW]
[MED] [MED]
iffusion
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Diffusiontidak semua partikel dapat melewati membran sel
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Diffusion
not allsubstances can pass thru a cell membrane.
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Facilitated Diffusion
Diffusion made easy Tidak memerlukan energi, perpindahan berdasarkan
gradien konsentrasi
Embedded proteins (channels) provide a convenient
pathway for LARGEand/or charged substances topass thru cell membrane. Also called passivediffusion
Another type of embedded protein, acarrier/transport protein, grabs hold and carries thesubstance thru a cell membrane. Sti l l , noenergy required
Ions, sugars, etc now can enter and leave cells
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Facilitated Diffusion
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Protein Channel
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NO ENERGY REQUIRED
IT IS A PASSIVEPROCESS
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OSMOSIS
Diffusion of water Passiveprocess,
does not require
energy
The membrane is
permeable to water,
the solvent.
The membrane isnot permeable
(impermeable) to the
solute.
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Water Balance in Animal Cells
If the cell is in a
hypertonic
environment
The environment hashigher [solute] than the
cell
The cell loses water
(osmosis) and shrivels
and may die
Osmosis kills
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Cells use energy (ATP)to move large molecules or ions thru a cell
membrane
Usually, these substances are moved uphillor against theconcentration gradient. In other words, the substances are moved in
the opposite direction of diffusion (passive transport)
Examples:pumps, exocytosis, endocytosis, phagocytosis,
pinocytosis.
Active Transport
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Active Transport: Pumps
A ti T t E t i
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Active Transport: ExocytosisFor really LARGE molecules, vesicles form and
fuse to the plasma membrane & spills its contents
out
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Active Transport: Endocytosis
1. Vesicles bud inward
2. Opposite ends of the cell
membrane meet & connect
3. Vesicle pinches off & brings
LARGE substances into cell
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AnAmoebafeedingvia the process of
endocytosis.
Active Transport: Endocytosis
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Active Transport: Pinocytosis
Cells actively engulf large
quantities of fluid (water)
Vesicles/vacuoles
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Active Transport: Phagocytosis