Download Cellular Transportation

Cellular
Transportation
Maintaining Equilibrium
Cellular Transport
Passive Transport
 Movement of particles across the cell
membrane without using energy
Three Modes of Passive Transport
 Diffusion
 Facilitated Diffusion
 Osmosis
Cellular Transport
Diffusion
 Movement of particles from an area of high
concentration to an area of lower concentration
Initial Conditions
Diffusion
Low
High
High
Low
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.
Cellular Structure and Function
Cellular Transport
Diffusion in a Cell
Cellular Structure and Function
Cellular Transport
Facilitated Diffusion
 Movement of materials across the plasma
membrane using proteins
Channel Proteins
Carrier Proteins
Cellular Structure and Function
Cellular Transport
Osmosis
 Diffusion of water across a selectively
permeable membrane
Three Types of Solutions
 Isotonic
 Hypotonic
 Hypertonic
Passive Transport
Cellular Structure and Function
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
Blood Cell
11,397x
Cellular Structure and Function
Cellular Transport
Hypotonic Solution
 Solute concentration is higher inside the cell.
 Water diffuses into the cell.
 The cell swells and may burst!
Plant Cell
Blood Cell
13,000x
Cellular Structure and Function
Cellular Transport
Hypertonic Solution
 Solute concentration is higher outside the cell.
 Water diffuses out of the cell.
 The cell will shrink!
Plant Cell
Blood Cell
13,000x
Cellular Structure and Function
Cellular Transport
Active Transport
 Movement of particles across the cell membrane
using energy
 The protein or membrane changes shape=energy used
Active Transport Using Carrier Proteins
Cellular Structure and Function
Cellular Transport
Types of Active Transport Pumps
 Na+/K+ ATP pump
 Moves three Na+ ions out of the cell and two
K+ ions into the cell
Cellular Structure and Function
Cellular Transport
Endocytosis
 Process by which the cell
surrounds and takes
particles into the cell
 “Cell Eating”
Exocytosis
 Secretion of material out
of the plasma membrane
 “Cell Pooping”
Active Transport
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http://www.youtube.com/watch?v=dPKvHrD1
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Cellular transport video