Download What is Homeostasis?

What is
Homeostasis?
Figure out what these pictures
have in common and you’ll
know a little more about
HOMEOSTASIS?
What do they have in
common?
Homeostasis- state of balance
Another word we can use is…
Equilibrium- a stable,
balanced, or unchanging
system
The human body wants
to stay balanced.
• When the internal and external
environments are constantly
changing, our bodies will:
- Shiver
- Sweat
- Throw Up
- Run Fever
Cells maintain homeostasis by:
Diffusion- The movement of
molecules from an area of
high concentration to an area
of low concentration
High
Low
Notice that the black dye is very dark
until it is dropped into the water.
The high concentration of color
moves to the lower concentration, no
mixing needed!
More examples of diffusion
Water soaking
into the soil
after the rain
Nutrients moving
from your blood
into your body
cells
Perfume
flowing
through a
room
A type of diffusion that
cells use is:
Osmosis- The movement of
water in/out of another
membrane.
Elodea cells before and after
soaking in salt water
Elodea cells in normal pond
water
Notice the empty space
between the cell wall and the
green chloroplasts!
Wouldn’t it be nice if we could
really learn this way?