Break into your lab groups and look at the
5 choose your transport cards on your lab
table.
Identify if the card is an
example of:
Diffusion, Osmosis or
Active Transport
Read pages 76 and 77 of the
Holt textbook and use the
information to create the
tri-fold described on the
next slide.
On the top of each tab, write a description
of what is happening to the cell if placed in
that particular environment. On the bottom
of the tab, draw a picture of how water is
moving in and out of the cell.
10% NaCl
90%H2O
10% NaCl
90%H2O
NO NET
MOVEMENT cell stays the
same
10% NaCl
90%H2O
20% NaCl
80%H2O
More water
moves into
the than
leaves the
cell causing
it to swell.
15% NaCl
85%H2O
5% NaCl
95%H2O
More water
moves out of
the cell than
into the cell
causing it to
shrink.
An osmosis investigation was conducted using chicken
eggs to represent cells with semipermeable membranes.
The mass of each egg was measured to determine how
much water diffused into or out of the eggs. The eggs
were first soaked in vinegar to dissolve the shell. Each
egg was then placed in one of three different solutions
for 24 hours.
Corn Syrup
5% water
Vinegar
85% water
Distilled Water
100% water
Based on your knowledge of osmosis and
the way water molecules move in various
solutions, what would happen if you took
a fish from the ocean (salt water) and
placed it in a fresh water lake?
Because it would be going from an
environment high in solute to an
environment much lower in solute, the
fish would swell and die.
What is an Isotonic Solution?
In an isotonic solution, the
concentration of dissolved
substances in the solution is the
same as the concentration of
dissolved substances inside the cell.
What happens to a cell when placed in
an isotonic Solution?
The cell remains unchanged
What is an Hypotonic Solution?
In an hypotonic solution the
concentration of dissolved
substances is lower in the solution
outside the cell than the
concentration inside the cell.
What happens to a cell when placed in
an Hypotonic Solution?
The cell will swell
What is an Hypertonic Solution?
In an hypertonic solution the
concentration of dissolved substance
outside the cell is higher than the
concentration inside the cell.
What happens to a cell when placed in
an Hypertonic Solution?
The cell will shrink