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