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1.
Explain concentration
gradient and diffusion with a
picture or diagram..
Also write a real-life example of
diffusion
Concentration Gradient
and Diffusion
Team 1
Leah, David, Nick
Concentration Gradient
The difference of a concentration of solutes
in a single solution between two regions.
Diffusion
The process by which molecules move from an area of
high concentration to low concentration
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_w
orks.html
Sugar dissolving in water. Sugar has a
higher concentration than the water
around it. The particles will move
randomly until they are evenly
distributed among the water. This is
more commonly known as dissolving the
sugar, but the process is called
diffusion.
Example
Molecules
Solution
Lid
Increase of
Temperature or
Pressure
Heat
The
difference
from the
beginning to
the end is
known as the
concentration
gradient.
2.
Discuss the similarities and differences between
diffusion and osmosis.
The Difference Between Osmosis
and Diffusion
Eddie Meyer
Niki Patil
Caleb Snider
Diffusion!
• Diffusion- the process by which molecules
spread from areas of higher concentration, to
lower concentration.
Osmosis
• Osmosis- is the diffusion of water across a
membrane.
The Difference Between Osmosis and
Diffusion
• Osmosis- Only water
can undergo osmosis.
• Diffusion- Can
involve any chemical
moving from one
place to another.
The Similarities Between Osmosis and
Diffusion
• Both are types of
passive transport
because no energy
is required to move
the molecules.
• They are both
equilibrium related
processes.
Works Cited Document
• http://www.biologycorner.com/bio1/diffusion.html
• http://sciweb.henryford.cc.mi.us/biology/jacobs/bio131
/diffusion/Diff&Os.html
• Google Images
• http://www.helium.com/items/1674518-thedifferences-between-diffusion-and-osmosis
3.
• What would happen to a cell if placed in the
following solutions (describe and illustrate).
– Isotonic solution:
– Hypotonic solution:
– Hypertonic solution:
Adam Knox, Kayla Halterman,
Alexandra Young, and
Emily Jones
Isotonic Solution:
A solution that has the same salt
concentration as the normal cells of the
body and the blood.
When a cell is placed in an isotonic solution,
the water diffuses into and out of the cell
at the same rate.
Hypotonic Solution:
A solution that has a lower salt concentration
as the normal cells of the body and the
blood.
When a cell is placed in a hypotonic
solution, the water diffuses into the cell,
causing the cell to swell and possibly
explode
Hypertonic Solution:
A solution that has a higher salt concentration as
the normal cells of the body and the blood.
When a cell is placed in a hypertonic
solution, the water diffuses out of the cell,
causing the cell to shrivel up.
4.
• Use pictures to illustrate and arrows to show the
direction of osmosis for each of the conditions below.
Assume the membrane is not permeable to sucrose.
• Intravenous solutions must be prepared so that they
are isotonic to red blood cells. A 0.9 % salt solution is
isotonic to red blood cells.
– Explain what will happen to a red blood cell placed in a
solution of 99.3% water and 0.7% salt.
– Explain what would happen to a red blood cell placed in a
solution of 90% water and 10% salt.
Blood
Water being pulled in.
Homeostasis occurs.
Water comes in and out.
Water being flushed out.
When there is less salt inside the cell
than there is around it, the cell swells, and
flushes water out. When there is more salt
than water, the cell will shrink and try to
pull more salt in. These processes occur
by the use of osmosis and diffusion.
5.
• Draw and describe a plant cell in a hypotonic
solution. How will a plant cell respond
differently than an animal cell? Why?
5
Draw and describe
a plant cell in a
hypotonic solution.
How will a plant
cell respond
differently than an
Hypotonic
Having deficient tone or tension
Having a lower osmotic pressure
than a surrounding medium or a
fluid under comparison
Osmotic
The diffusion of fluids
through membranes or
porous patricians
Onion Cell before and after being
put in a Hypotonic Solution
Before
After
Hypotonic Solutions abosorbs so much water out of
the water out of cells that they may burst open.
The plant cells usually do not explode
Animal Cells Mostly do Explode
Because:
They don’t have a cell wall to
keep the structure intact, but
plant cells do
6.
• For the most part, plants and animal live in
either a salt water environment or a fresh
water environment, not both. Explain this
using the principles of diffusion.
Diffusion with Fish
Charles Salo
Bente Bouthier
Loretta Wendel
Hadlee Swope

http://physioweb.med.uvm.edu/diffusion/
MultiWithMembPages.htm

For the most part, plants and animal live
in either a salt water environment or a
fresh water environment, not both.
Explain this using the principles of
diffusion.
Our Answer

Fish drink water. Salt draws water to it.
In freshwater fish do not have to drink
because their bodies are saltier than the
water, and draw water in.
 Saltwater fish need to because the water
is saltier than their bodies, and draws
water out.

What that means

If freshwater and saltwater fish were to
switch environments they would die. A
Saltwater fish would shrivel up and die,
while a freshwater fish would inflate and
waterlog itself.
7.
• What is required for active transport to occur?
• Primary Active transport uses chemical
energy such as ATP
• Secondary Active Transport uses an
electrochemical gradient
• Active Transport uses energy as opposed
to Passive Transport which uses no
energy
Videos:
• http://sciencestage.com/v/639/cellmembrane-active-transport.html
• http://www.dnatube.com/video/1589/CellMembrane-Active-Transport
8.
• What if there is a large food particle or
organism that a predatory cell – like an
amoeba – wants to eat? It must use a process
called exocytosis. Draw a diagram showing
how this process works. Give two examples of
substances that a cell might export this way.
By:
William Anderson
Mikayla Cregg
Jordan Kraft
Exocytosis is the
movement of substances
out of a cell.
These substances can
include hormones,
proteins, and waste
products.
• http://www.maxanim.com/physiology/Endo
cytosis%20and%20Exocytosis/Endocytosi
s%20and%20Exocytosis.htm
Cell Transport
• Active
• Passive
• Diffusion
– Facilitated Diffusion
•
•
•
•
•
Osmosis
Isotonic
Hypertonic
Hypotonic
Endocytosis
Osmosis: Diffusion of Water
• The diffusion of water across a selectively
permeable membrane is called osmosis.
Real- World Applications
• Plant Cells: Cellular Respiration
• Preserving Fruit and Meat
• Medicine
– IV
– Storage of Red Blood Cells
When comparing two solutions
to one another, we define:
A.
Hypotonic
solution has a
lower solute
concentration
B.
Hypertonic
solution has a
higher solute
concentrations
Isotonic – solutions with equal
concentration. Osmosis Simulation