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Cell Membrane Transport, Requires energy, Regulate what goes IN nad OUT of…
Cell Membrane Transport
Passive Transport (Diffusion)
Simple Difussion
Small, non-polar molecules (ex:gases)
Pass through the phospholipid bilayer
Facilitated Diffusion
Big, polar molecules (ex: glucose)
Molecules pass through protein channels
Osmosis
Is the property of water
Is the movement of water through a semipermeable membrane. From a region of higher water concentration to a region of lower water concentration.
Concentration is NOT the same as volume.
Volume: the amount of water
Concentration: the amount of water + solute
Types
Hypertonic
Less amount of water than amount of solute
Hypotonic
More amount of water than amount of solute
Isotonic
The same amount of water and solute
Transportation
Water molecules pass throuhg by using a transport protein called aquaporin, if there are an abundant amount.
Water molecules pass through the phospholipid bylayer if there are few.
Objective: balance
Active Transport
Through Membrane
Engulfing Membrane (Cytosis)
Endo(cytosis)
Collects things form the outside of the cell and a vesicle is created to move these proteins into the golgi apparatus, where they are selected and organized to go into their respective places. Then, these proteins are driven through a vesicle to the lysosome inside the cell (this is an example).
Import molecules inside the cell
Exo(cytosis)
Export molecules outside the cell
Requires energy
Uses ATP as energy
Regulate what goes IN nad OUT of the cell
to keep HOMEOSTASIS
Doesn't need energy
Molecules move WITH the concentration (molecules) gradient ((the flow))
Molecules move AGAINST the concentration gradient (the flow)
Vesicles: Piece of the membrane that creates a bubble