Download Movement Through the Cell Membrane

Notes on Chapter 7 - Section 3
Molecular Movement
MAIN IDEA
Cell
 DETAILS
 DETAILS
 Made of lipid
-Tough &
Membrane bilayer (2 layer) flexible
 Regulates
barrier
movement into
and out of cell
 Has proteins to -Proteins are
help move
“carrier”
molecules
molecules
 Provide
protection &
support
Diffusion  Movement of -Does not
molecules
require
from an area
energy
of high
concentration
to an area of
low
concentration
until equal
Osmosis The
diffusion of
water
through a
selectively
permeable
membrane
- No energy
needed
-“selects”
what can
move across
-Moves from
high to low
until equal
Effects of Osmosis on
Cells & Solution Types
Isotonic  The amount of
Iso=equal
solution dissolved
substances are the
same in the
solution as the
amount in the cell
 The movement of
water into the cell
equals the water
out of the cell
 Hypotonic The amount
solution
of dissolved
substances is
lower in the
solution
outside the
cell
Water moves
into the cell
Hypo=less
than
-Animal cell will
swell & burst
-Plant cell fills
with water,
pushing against
cell wall
 Hypertonic
solution
 The amount
of dissolved
substances
outside the
cell is greater
than what is
inside the cell
 Water moves
out of the cell
Hyper =
greater
than
-Causes animal
cell to lose
water & shrink
-Plant cell loses
water &
collapses
Solution Types Review
 Isotonic
 Hypotonic  Hypertonic
solution


Equal amounts of
solutes inside &
outside the cell
No net movement
of water
solution

Less solutes
outside cell
 Water moves
into cell
solution

More solutes
outside cell
 Water moves out
of cell