Cell Transport Mechanisms

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Diffusion
Movement of particles from an area of high to low concentration across a partially permeable membrane
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Factors affecting diffusion
1) Temperature, 2) Surface Area, 3) Distance, 4) Concentration Gradient
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Diffusion: Passive or Active Transport?
Passive - the cell uses no energy, thermal energy is supplied to the cell
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Diffusion: Molecules involved
very small, polar molecules and slightly bigger non-polar molecules
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Osmosis
The net movement of free water molecules from a low solute to a high solute concentration across a partially permeable membrane
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Osmosis: Passive/Active?
Passive - the cell uses no energy, thermal energy is supplied to the cell
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Molecules involved
Only water molecules are involved in osmosis
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Name 4 substances inside the cytoplasm
enzymes, glucose, solutes, oxygen
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Facilitated Diffusion
The random movement of particles from an area of low to high concentration
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Molecules involved
Larger polar molecules which can't normally move through the membrane
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Channel proteins
Proteins within the cell membrane with a gap between them allowing molecules to pass through
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Facilitated Diffusion: Passive or Active?
Passive - the cell uses no energy, thermal energy is supplied to the cell
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Active Transport
The movement if a molecule from a low to high concentration of that molecule using carrier proteins and ATP
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Active Transport: Passive or Active?
Active: the cell uses an internal store of energy called ATP which can be found in all cells
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ATP
Adenosine Triphosphate, consisting of three phosphate atoms bonded together, the bonds can be broken to release energy and are rebuilt using glucose
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Carrier Proteins
The molecule attaches to this protein, it changes shape and carries the molecule through it to the other side of the membrane
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Molecules involved in Active transport
Large molecules
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The Four Mechanisms of Cell transport
-Osmosis, Diffusion, Facilitated Diffusion Active Transport
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The active transport mechanism uses what energy source?
ATP - internal source found in every cell, glucose is used to repair the bonds which are broken to release energy
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Other cards in this set

Card 2

Front

Factors affecting diffusion

Back

1) Temperature, 2) Surface Area, 3) Distance, 4) Concentration Gradient

Card 3

Front

Diffusion: Passive or Active Transport?

Back

Preview of the front of card 3

Card 4

Front

Diffusion: Molecules involved

Back

Preview of the front of card 4

Card 5

Front

Osmosis

Back

Preview of the front of card 5
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