Transcript Objective: Explain how materials move through simple diffusion.  What cell organelle allows things to move in and out of the cell?  What things.

Objective: Explain how materials
move through simple diffusion.
 What
cell organelle allows things to move
in and out of the cell?
 What
things are allowed in and out of the
cell?
Discuss the questions with your Elbow
Partner.
 Passive Transport: the
movement of
substances through the cell membrane
without the input of energy.
 There
are 3 types of passive transport.
 Diffusion
is the random movement of
molecules from an area where there is
more of them into an area where there is
less.
 When the molecules have equaled out,
they have reached an equilibrium.
 Osmosis: the
diffusion of water through a
cell membrane
 Facilitated
diffusion: when large
substances (like sugar molecules) need
the help of a transport protein to enter
the cell.
 Active
transport: when an input of energy
is required to move materials through the
cell membrane
 This process uses transport proteins also.
 The molecules in active transport usually
go from lower to higher.
PASSIVE TRANSPORT





Requires no energy
Diffusion
Osmosis
Facilitated diffusion
Go from areas of more to
areas of fewer
ACTIVE TRANSPORT


Requires energy
Go from areas of fewer to
areas of more
Both ways are used by molecules and
particles too large to be moved by
transport proteins.
Endocytosis
 Process of taking in
substances into the
cell membrane by
surrounding it.

 Exocytosis
 Occurs
the opposite
way of endocytosis.
The contents inside
will be released
Describe how each of the following materials
would get through the cell membrane and
into a cell:
1.
Pure water (osmosis)
2.
Sugar entering a cell that already contains a
high concentration of particles(active transport)
3.
Sugar entering a cell that has a low
concentration of particles(passive transport)
4.
A protein(endocytosis)