Download 4.1 Answer packet for quiz

Name:_______________________________
Date:__________
Review Packet Lesson 4.1
Section: 6-_____
Vocabulary:
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Osmosis- Is the diffusion of water through a cell membrane.
Diffusion- Is the movement of particles from an area where
their concentration is high to an area where their concentration
is low
Endocytosis- The process in which a cell membrane surrounds a
particle and encloses it in a vesicle to bring it into the cell
Exocytosis – The process used to remove large particles from a
cell; during exocytosis, a vesicle containing the particles fuses with
the cell membrane.
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Passive Transport – The diffusion of particles through proteins in
the cell membrane from areas where the concentration of particles is
high to areas where the concentration of particles is low
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Active Transport – The movement of particles through the proteins
in the cell membrane against the direction of diffusion; requires cells
to use energy
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Solutes- are substances like salt and sugar.
Review:
 The exchange of materials between a cell and its environment takes
place across cell cell membrane.
 Water is the substance used during osmosis.
 Osmosis is a type of passive transport. Water molecules do not need
energy to enter the cell.
 Large particles (protein) have a hard time entering the cell. The cell
uses active transport; this requires energy).
 The cell membrane is a semi permeable membrane; not all particles
can go through.
 Hypertonic has a high concentration of solutes. Water moves to the
grater solute concentration.
 Hypotonic has a low concentration of solutes.
 Isotonic is when the concentration is at equilibrium (balance).
Example: IV fluid
Osmosis in Real Life:
 If a person received regular water in his/her IV, what would
happen to the red blood cells? Why does this happen?
The red blood cells would swell. This would happen
because the reb blood cell has a higher solute
concentration. Water moves to the higher solute
concentration.
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When it is snowing, trucks put salt on the ground. What
happens to the plants on the ground when the salt is added?
Why does this happen?
When salt is added to a plant, the salt will cause the
plant to wilt. The water will leave the plant because
the salt outside the plant has a higher solute
concentration.
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How is a cell membrane like a screen? (think of the lab we did)
The cell membrane is like a screen because only somethings
can get through a screen; just like the cell membrane. Large
particles (like protein) are too big to fit through the cell
membrane.