Cell Transport
(1)
Passive Transport/Diffusion
Passive Transport/Diffusion
 The movement of particles from HIGH concentration to
LOW concentration.
Diffusion example
 Does NOT use energy.
 May go through cell membrane or proteins in the cell
membrane.
 Example: Spraying Perfume
 Example: Sugar in Iced Tea
Facilitated Diffusion
 The molecules move from an area of high
concentration to an area of low concentration
 Movement does not require energy (passive
transport)
 The movement of larger molecules (like sugar
molecules)
 Uses a membrane protein to go through the
membrane
Passive Transport/Osmosis: The diffusion of
water
Osmosis in a Cell
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Active Transport
(2)
Active Transport
 The movement of particles from LOW concentration to
HIGH concentration.
 DOES use energy.
 May go through proteins in the cell membrane.
Bulk Transport-Active
 Endocytosis- the cell membrane folds into
a pouch (vesicle) that encloses the large
particles
Bulk Transport-Active
 Exocytosis- the release of cell
products and wastes from the cell
Tonicity (descriptive words used to compare
solutions)
Water will diffuse to where there is more
solute.
 Hypotonic Solution - One solution has a lower
concentration of solute than another.
 Hypertonic Solution - one solution has a higher
concentration of solute than another.
 Isotonic Solution - both solutions have same
concentrations of solute.
Plant and Animal Cells put into various
solutions