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DIFFUSION & OSMOSIS
Cell membranes are permeable (having pores or openings) to water, therefore, the environment the cell is exposed to can have a dramatic effect on the cell.
Passive Transport Active Transport
DIFFUSION Molecules move from areas of higher concentrations to areas of lower concentrations
Osmosis: the movement of water molecules from an area of high concentration to an area of low concentration.
Isotonic Isotonic : contains the same concentration inside & outside the cell. Water diffuses into & out of cell at the same rate.
Hypotonic contains a low concentration) The water diffuses into the cell, causing the cell to swell and possibly explode. Hypotonic
Hypertonic : contains a high concentration The water diffuses out of the cell, causing the cell to shrivel. Hypertonic
Question? How does the cell membrane know what to let in and what to let out?
Passive & Active TransportYou should know & be able to explain the following points: Osmosis Diffusion Membrane structure Selective Permeability Passive & Active Transport
Osmosis Osmosis is the net movement of water molecules over a partially permeable membrane from an area of less osmotic potential to an area of more negative.
* Water Concentrations * Movement of water molecules (H20) across a permeable membrane. * Molecules move from area of high concentrations to areas of.
Membranes Chap. 5. Phosophlipids Phospholipids will form a bilayer when placed in water. Phospholipid bilayers are fluid.
Section Objectives Explain how the processes of diffusion, passive transport, and active transport occur and why they are important to cells. Predict.
Osmosis (diffusion of water through a selectively permeable membrane) Membrane X is permeable to water but not to protein Which side has the highest concentration.
Movement IN and OUT of Cells Substances move in and out through the cell membrane Moving from high to low concentration DOES NOT REQUIRE ENERGY by the.
The Selectively permeable Cell Membrane Diffusion, osmosis, and active transport.
OSMOSIS OSMOSIS: The diffusion of water through a selectively permeable membrane SELECTIVELY PERMEABLE: some substances pass like water and others do.
Osmosis and Diffusion Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)
Cells and Cellular Transport
Objectives: 1) Explain how the processes of diffusion and osmosis occur and why they are important to cells. 2) Predict the effect of a hypotonic, hypertonic,
Plant and Animal Cell Structures
Osmosis Problem Practice
Cellular Functions Biology Agriculture.
Osmosis. Energy requirements? No energy required Modes of passive transport? Diffusion through cell membrane The movement of a substance from.
By Chonell Peralta and Rosa Parra OSMOSIS AND DIFFUSION.
Movement of particles across the cell membrane without using energy
Passive Transport Section 4.1.
Ms. Mezzetti Lynn English High School Science Department.
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