2transport membran

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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