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Transcript
CELL
TRANSPORT
The Cell Membrane is
selectively permeable.
Some substances can
pass through it and
others cannot.
TWO METHODS
Passive Transport
• Diffusion
• Osmosis
• Facilitated Diffusion
DIFFUSION
• Process by which
molecules tend to move
from an area of higher
concentration to an area
of lower concentration.
OSMOSIS
• The diffusion of water
molecules through a
selectively permeable
membrane. Cells can
not function properly
without adequate water
Facilitated Diffusion
Some material just can’t
get through the membrane
without a little help. Carrier
molecules are happy to
lend a hand. This does not
use any energy. FYI only
Active Transport
•Endocytosis
•Excocytosis
Endocytosis
The process of bringing a large
substance into the cell in a vesicle.
Exocytosis
The process of large particles leaving a
cell in a vesicle.