Transcript Cell Transport I - christophersonbiology

Cell Transport II: Diffusion and
Osmosis
Christopherson
Homeostasis
The ability of an organism to adjust its
internal environment to keep it stable.
Where are WE?
Tissue
Organism
Cell Transport is
fueled by the
need of the cell
to maintain
homeostasis
Diffusion
Movement of particles from an high
concentration to a low concentration;
reach homeostasis
High
Low
What is concentration?
The amount of a substance
High concentration means there is a lot
present
External examples of diffusion
a. Food coloring and water
High concentration (amount of substance)
Low concentration
External examples of diffusion
b. Lotions/Perfume/Unpleasant odors in a
closed room
Substances that can diffuse across the
cell membrane
Certain substances can diffuse straight
across the phospholipid bilayer
Phospholipid bilayer
Examples of Diffusion
a. Oxygen and Carbon dioxide exchange in the
blood
Osmosis: Introductory Terms
Solution: A mixture of two or more
substances; both are completely dissolved
Osmosis: Introductory Terms
Solvent: The dissolver; usually a liquid
Osmosis: Introductory Terms
Solute: Disolvee; what is being dissolved
Osmosis
Movement of WATER from a high to a low
concentration
Hint:
a. Water will ALWAYS move to the higher
concentration of dissolved substances.
Hint:
b. Solute SUCKS solvent (water)!!!!
Solute
Water
Isotonic Solution
• Cell remains same
size
• Water moves in and
out at same rate
(time)
• The concentration
of dissolved
substances is equal
in and out of cell.
*RBC Video
*Elodea Video
Hypo = Hippo (BIG!!! SWOLLEN!!)
Hypotonic Solution
• Cell swells
• Water moves in
• The higher
concentration of
dissolved
substances is
__________ the
cell.
*RBC Video
*Celery Video
Hyper = Hyperactive
(Want energy out!!!)
Hypertonic Solution
• Cell shrinks
• Water moves out
• The higher
concentration of
dissolved
substances is
__________ the
cell.
*RBC Video
*Elodea Video
*Onion Video
Review
Select LINK; read and work through the virtual lab
What would happen if a Clown Fish (Nemo)
was placed in a freshwater aquarium?
SALT
Water would
move into the
fish cells
causing all of
the cells to
swell and
burst; it is a
hypotonic
environment
What would happen if a Goldfish was placed
in the ocean?
Water would
move out of
the fish cells
causing all of
the cells to
shrink; it is a
hypertonic
environment
SALT