Cellular transport is the process of moving
materials into and out of the cell.
Materials such as water, sugar(glucose),
oxygen, and carbon dioxide into and out of
cells because they are needed to carry out
important reactions in the cell. These reactions
are responsible for creating food within cells
and producing energy.
Cellular transport can be categorized into one
of three groups:
Passive transport is the movement of materials
across the cell membrane with out the use of
When passive transport occurs molecules
are transported across the cell by way of a
process known as diffusion.
Diffusion is the
movement of molecules
from an area where
there is more of them to
an area where there is
less of them.
continue to move until
equilibrium is reached.
Osmosis is the diffusion of water.
This type of diffusion has a special name
because water is vital to life of the cell
Facilitated diffusion is the final
type of passive transport we
will learn about today.
Facilitated diffusion is a process
which occurs with substances
like sugar (glucose) that are too
large to pass through the cell
membrane by diffusion.
These substances enter and
leave the cell through transport
proteins which are like
doorways into the cell for