10/19/2012 1 Cellular Transport Passive Transport Movement of particles across the plasma membrane without using energy. Three Modes of Passive Transport Diffusion Facilitated Diffusion Osmosis Diffusion in a Cell Movement of particles from an area of high concentration to an area of lower concentration Carrier Proteins Channel Proteins Facilitated Diffusion Movement of materials across the plasma membrane using proteins. Cellular Structure and Function Osmosis Diffusion of water across a selectively permeable membrane Three Types of Solutions Isotonic Hypotonic Hypertonic
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10/19/2012
1
Cellular Transport
Passive Transport
�Movement of particles across the plasma
membrane without using energy.
Three Modes of Passive Transport
�Diffusion �Facilitated Diffusion �Osmosis
Diffusion in a Cell
�Movement of particles from an area of
high concentration to an area of lower concentration
Carrier ProteinsChannel Proteins
Facilitated Diffusion
�Movement of materials across the
plasma membrane using proteins.
Cellular Structure and FunctionOsmosis
�Diffusion of water across a selectively
permeable membrane
Three Types of Solutions
�Isotonic
�Hypotonic
�Hypertonic
10/19/2012
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Cellular Structure and Function
Blood CellPlant Cell
Isotonic Solution
�Water and dissolved substances diffuse
into and out of the cell at the same rate.
�Cell stays the same size.
11,397x
Blood Cell
Hypotonic Solution
�Solute concentration is higher inside the
cell.
�Water diffuses into the cell and swells.
Plant Cell
13,000x
Plant Cell
Hypertonic Solution�Solute concentration is higher outside
the cell.�Water diffuses out of the cell and shrinks.