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SFB #___
Diffusion/Osmosis Notes
Integrated Science 1
9/15
Name:
Period:
I. Definitions:
solute: a substance that gets ____________________________ (ex: ___________________)
solvent: a substance in which a __________________ is dissolved (ex: ___________________)
solution: a __________________________ in which a solute is dissolved evenly throughout a
____________________ (ex: __________________________)
concentration: the percent represented by either the ___________________ or _________________.
In ocean water, _______________ is the solute, _______________ is the solvent, and the result is a solution.
Salt and water can be in a variety of _______________________________ which make the water more
or less salty.
diffusion: the movement of molecules in a ______________________ from an area of ___________________
concentration to an area of _________________________ concentration.
osmosis: the diffusion of ______________________ molecules from high to low concentration.
semi-permeable membrane: a membrane which ________________________ the passage of some molecules
(ex. Water), while ______________________ the passage of other substances (some molecules are
prevented from passing through due to their _____________________ and/or ______________________).
water
II. Osmosis and Cells – 3 Examples
A. Hypotonic– a situation where there is a solution with a _______________________ concentration of
_________________ outside the cell compared to the concentration of ___________________ inside the
cell

Ex: a single-cell salt water organism is placed in a fresh or _________________ water solution

Since _______________ is too big to move, through the membrane, water moves from an area of high
concentration in the brackish water through the cell’s membrane, causing the cell to ______________.
This will continue to happen until the concentration of water inside the cell equals the concentration
outside the cell or until the cell _______________
B. Hypertonic - a situation where there is a solution with a _______________________ concentration of
_________________ outside the cell compared to the concentration of _________________ inside the cell.

Ex: a single-cell fresh water organism is placed in ______________________ solution

Since _______________ is too big to move, water moves from an area of high concentration inside the
cell through the cell’s membrane causing the cell to __________________. This will continue to
happen until the concentration of water inside the cell equals the concentration outside the cell or until
the cell _______________
C. Isotonic– a situation where there is a solution with an ___________________ concentration of
_______________ outside the cell compared to the concentration of ___________________ inside the cell

Ex: a single human red blood cell is placed in a 0.9% saline (salt) solution

Since the concentration of _____________ and _______________ is the same inside and outside the
cell, neither the salt nor the water has to move to balance. Water can still pass through the cell’s
membrane but there is no net ____________ or ___________ of water inside the cell
Some organisms have developed adaptations to prevent themselves from swelling or shrinking
III. Facilitated Diffusion
A. moves molecules from a ______________ to _____________ concentration
B. no ___________________ required (In the direction nature intends)
C. molecules called ____________________ proteins imbedded in the cell membrane __________________
the movement
D. Organisms now can move ____________ in or out of their cells to balance themselves instead of being
_______________________/emptied of water
E. Ex: Red blood cells carry and deliver ________________________ into the bloodstream
IV. Active Transport
A. Moves molecules from an area of ____________________ concentration to an area of higher concentration
(the ________________________ direction than nature intends)
B. an __________________________ requiring both carrier proteins and _____________________
C. carrier proteins and high energy molecules __________________ molecules from ____________ to
High concentration
D. Ex: The gills of marine fish have cells that _________________ salt from the body and pump it back into
The water
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