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Transcript 
Section 4
Cellular Structure and Function
Cellular Transport
Passive Transport
 Movement of particles across the cell
membrane without using energy
Three Modes of Passive Transport
 Diffusion
 Facilitated Diffusion
 Osmosis
Section 4
Cellular Structure and Function
Cellular Transport
Diffusion
 Movement of particles from an area of high
concentration to an area of lower concentration
Section 4
Cellular Structure and Function
Cellular Transport
 Diffusion is controlled by
 Temperature
 Pressure
 Concentration
Dynamic Equilibrium
 Reached when diffusion of material into the
cell equals diffusion of material out of the cell
 Molecules continue to move, but the overall
concentration remains the same.
Section 4
Cellular Structure and Function
Cellular Transport
Diffusion in a Cell
Section 4
Cellular Structure and Function
Cellular Transport
Facilitated Diffusion
 Movement of materials across the plasma
membrane using proteins
Section 4
Cellular Structure and Function
Cellular Transport
Channel Proteins
Carrier Proteins
Section 4
Cellular Structure and Function
Cellular Transport
Osmosis
 Diffusion of water across a selectively
permeable membrane
Three Types of Solutions
 Isotonic
 Hypotonic
 Hypertonic
Section 4
Cellular Structure and Function
Cellular Transport
Isotonic Solution
 Water and dissolved substances diffuse into
and out of the cell at the same rate.
Plant Cell
Section 4
Cellular Structure and Function
Cellular Transport
Hypotonic Solution
 Solute concentration is higher inside the cell.
 Water diffuses into the cell.
Plant Cell
Section 4
Cellular Structure and Function
Cellular Transport
Hypertonic Solution
 Solute concentration is higher outside the cell.
 Water diffuses out of the cell.
Plant Cell
Section 4
Cellular Structure and Function
Cellular Transport
Active Transport
 Movement of particles across the cell
membrane using energy
Active Transport Using Carrier Proteins
Section 4
Cellular Structure and Function
Cellular Transport
Types of Active Transport Pumps
 Na+/K+ ATPase pump
 Moves three Na+ ions out of the cell and
two K+ ions into the cell
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