Diffusion & OsmosisDiffusion & Osmosis

THE CELL MEMBRANE AND THE FLUID MOSAIC THEORY - explain how foodAnd gases enter and leave the cell

Flip flop theoryExplains how water goes in and out

DIFFUSION – TO GO FROM AN AREA OF GREATER CONCENTRATION TO AN AREA OF LESSER CONCENTRATION

AREA OF GREATER CONCENTRATION

AREA OF LESSER CONCENTRATION

OSMOSIS IS THE MOVEMENT OF WATER MOLECULES FROM AN AREA OF GREATER CONCENTRATION TO AN AREA OF LESSER CONCENTRATION

THE FILE ABOVE IS JUST AN ANIMATED GIF FILE

THIS IS AN AREA HOLDING BLOOD & OTHER MOLECULESIN BLOOD PLASMA, AND AN AREA WHERE URINE IS COLLECTED. THESE 2 AREAS ARE SEPARATED BY A SEMI - PERMEABLE MEMBRANE SIMILAR TO THE MEMBRANE AND SEPARATION THAT OCCURS IN YOUR KIDNEYS.

urine blood

Active transport explains what happens when the cell uses

ENERGYTo transport something across the cell membrane

Low to high

PINOCYTOSIS IS THE INGESTION OFDISSOLVED MATERIALS BY ENDOCYTOSIS. THE PLASMA MEMBRANE INDENTS IN ANDPINCHES OFF PLACING DROPLETS OF FLUID INA PINOCYTIC VESICLE. THE LIQUID CONTENTS OF THE VESICLE ARETHEN SLOWLY TRANSFERRED INTO THE CYTOPLASM

EXOCYTOSIS IS A PROCESS IN WHICH AN INTRACELLULAR VESICLE MOVES TO THE PLASMAMEMBRANE AND SUBSEQUENT FUSION OF THEVESICLES MEMBRANE AND THE CELL MEMBRANEOCCURS…

LEVELS OF ORGANIZATION

Define Diffusion Define Diffusion

Define DiffusionDefine Diffusion

The movement of molecules from a The movement of molecules from a area in which they are highly area in which they are highly concentrated to a area in which they concentrated to a area in which they are less concentrated. are less concentrated.

DiffusionDiffusion

See an animation of See an animation of diffusion here:diffusion here:

http://http://lewis.eeb.uconn.edu/lewis.eeb.uconn.edu/lewishome/applets/lewishome/applets/

Diffusion/diffusion.html Diffusion/diffusion.html

Define osmosisDefine osmosis

Define osmosisDefine osmosis

The diffusion of The diffusion of waterwater across a across a selectively permeable selectively permeable membranemembrane. .

Define osmosisDefine osmosis    Water moves from a high Water moves from a high

concentration of water (less salt or concentration of water (less salt or sugar dissolved in it) to a low sugar dissolved in it) to a low concentration of water (more salt or concentration of water (more salt or sugar dissolved in it).  This means sugar dissolved in it).  This means that water would cross a selectively that water would cross a selectively permeable membrane from a dilute permeable membrane from a dilute solution (less dissolved in it) to a solution (less dissolved in it) to a concentrated solution (more concentrated solution (more dissolved in it).dissolved in it).

http://www.usd.edu/~bgoodman/Osmos.htm

http://www.usd.edu/~bgoodman/Osmos.htm

Define osmosisDefine osmosis

Define osmosisDefine osmosis In this picture a red blood In this picture a red blood

cell is put in a glass of cell is put in a glass of distilled water (all water distilled water (all water with no salt or sugar in it).  with no salt or sugar in it).  Because there is a higher Because there is a higher concentration of water concentration of water outside the cell, water outside the cell, water enters the cell by enters the cell by OSMOSISOSMOSIS.  In this case too .  In this case too much water enters and the much water enters and the cell swells to the point of cell swells to the point of bursting open.  In the end bursting open.  In the end pieces of cell membrane pieces of cell membrane are left in the water. are left in the water.

http://www.usd.edu/~bgoodman/Osmos.htm

See an animation of See an animation of osmosis here:osmosis here:

http://http://lewis.eeb.uconn.edu/lewis.eeb.uconn.edu/lewishome/applets/lewishome/applets/

Osmosis/osmosis.html Osmosis/osmosis.html

Define selectively Define selectively permeable membrane permeable membrane

Define selectively permeable Define selectively permeable membranemembrane

A membrane that allows only certain A membrane that allows only certain materials to cross it materials to cross it

Materials pass through Materials pass through porespores in the in the membranemembrane

For more information on For more information on diffusion & osmosis, click diffusion & osmosis, click

here:here:

http://edtech.clas.pdx.edu/http://edtech.clas.pdx.edu/osmosis_tutorial/default.html osmosis_tutorial/default.html

Why are osmosis & Why are osmosis & diffusion important?diffusion important?

Why are osmosis & diffusion Why are osmosis & diffusion important?important?

All living things have certain requirements All living things have certain requirements they must satisfy in order to remain alive – they must satisfy in order to remain alive – maintain maintain homeostasishomeostasis

These include exchanging gases (usually These include exchanging gases (usually CO2 and O2), taking in water, minerals, CO2 and O2), taking in water, minerals, and food, and eliminating wastes. and food, and eliminating wastes.

These tasks happen at the cellular level.These tasks happen at the cellular level. Molecules move through the cell Molecules move through the cell

membrane by diffusionmembrane by diffusion

Why are osmosis & diffusion Why are osmosis & diffusion important?important?

All living things have certain All living things have certain requirements they must satisfy in requirements they must satisfy in order to remain alive. These include order to remain alive. These include exchanging gases (usually CO2 and exchanging gases (usually CO2 and O2), taking in water, minerals, and O2), taking in water, minerals, and food, and eliminating wastes. These food, and eliminating wastes. These tasks ultimately occur at the cellular tasks ultimately occur at the cellular level, and require that molecules level, and require that molecules move through the membrane that move through the membrane that surrounds the cell. surrounds the cell.

Why are osmosis & diffusion Why are osmosis & diffusion important?important?

This membrane is a complex This membrane is a complex structure that is responsible for structure that is responsible for separating the contents of the cell separating the contents of the cell from its surroundings, for controlling from its surroundings, for controlling the movement of materials into and the movement of materials into and out of the cell, and for interacting out of the cell, and for interacting with the environment surrounding with the environment surrounding the cell. the cell.

Review Osmosis & Review Osmosis & Diffusion Here:Diffusion Here:

http://wappingersschools.org/WJhttp://wappingersschools.org/WJH/teachers/science/Jim_Site/asigH/teachers/science/Jim_Site/asig

nments/cells/diffusionetc/nments/cells/diffusionetc/diffusion_osmosis.html diffusion_osmosis.html