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Copy of Osmosis and Diffusion

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baird swedman

on 13 September 2015

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Transcript of Copy of Osmosis and Diffusion

Osmosis and Diffusion
Diffusion involves the movement of
particles
across a membrane.

Osmosis, on the other hand, involves the movement of
water
across a membrane. Both of these processes are types of.....
Being dependent on the permeability of the membrane, passive transport does
not
involve the use chemical energy.
Passive Transport
Facilitated Diffusion
Hypertonic
Having a
higher
osmotic pressure in a fluid relative to another fluid.
Forces water to
leave
the cell so that the shape of the cell becomes distorted and wrinkled, a state known as
crenation
Hypotonic
having a
lesser
osmotic pressure in a fluid compared to another fluid
Water will be drawn out of the solution and
into the cell
by osmosis.
If water molecules continue to diffuse into the cell, it will cause the cell to swell, up to the point that
cytolysis
(rupture) may occur.
Isotonic
Osmote concentration is the same as the solute concentration of another solution with which it is compared.
Water molecules diffuse through the plasma membrane in both directions, and as the rate of water diffusion is the same in both direction that cell will neither gain nor lose water.
Includes diffusion and osmosis.
the movement of molecules across the cell membrane via special transport proteins that are embedded within the cellular membrane.
molecules too large to pass into the cell membrane use this type of diffusion
Diffusion
net movement of material from an area of high concentration to an area with lower concentration
Osmosis
Osmosis specifically describes the movement of water (not the solute) across a membrane until there is an equal concentration of water and solute on both sides of the membrane
moves solutes "down the concentration gradient"
Osmosis provides the primary means by which water is transported into and out of cells
Filtration
Filtration is movement of water and solute molecules across the cell membrane due to hydrostatic pressure generated by the cardiovascular system.
Depending on the size of the membrane pores, only solutes of a certain size may pass through it.
Osmosis Lab w/ Egg
Diffusion Lab
Iodine turns blue in reaction to starch
Iodine molecules are smaller than the starch molecules and therefore pass into the "membrane" of the dialysis bag
Presentation By:
Cathrine Carver
Madison Collins
Blake Gelb
Kathryn Carroll
Life at the Edge
The plasma membrane separates the cell from its surroundings

8,000 stacked plasma membranes are as thick as a piece of paper

These membranes exhibit selective permeability - they allow certain substances to pass through easier than others
Plasma Membrane
Full transcript