Transcript Cellular Movement

Cellular Movement
Passive and Active Transport
Passive Transport

Does NOT require ENERGY to move particles
into or out of a cell

Movement of particles from HIGHER
concentration to LOWER concentration

DIFFUSION – movement of particles

OSMOSIS – movement of water
DIFFUSION

Movement of particles from a HIGHER
concentration to a LOWER concentration

Example: Smell of baking cookies from the
oven moving through the house.
OSMOSIS

Movement of
WATER from a
HIGHER
concentration to a
LOWER
concentration

Example: Plant
taking in water
during a rainy
day.
Active Transport

Requires ATP ENERGY to move particles
into or out of cell

Movement of particles from LOWER
concentration to HIGHER concentration

Endocytosis

Exocytosis
ENDOCYTOSIS

Cell
membrane
encloses a
vesicle filled
with particles
and absorbs it,
BRINGING
IT INTO the
cell
EXOCYTOSIS

Cell membrane
encloses a
vesicle filled
with particles
and PUSHES
IT OUT of the
cell
Active Transport Example:

A person trying to
squeeze into an
already crowded
elevator!

It takes ENERGY
to do so!
Equilibrium

In all cases, cells
want
EQUILIBRIUM!
Too much (or too
little) of a good
thing is BAD for
the cell!
What happens to cells when
put in salt water?

This is why you do not want to drink salt
water when you are lost at sea!
Water moves out of the
cell to try to reach
equilibrium. The cell
dries out!