Name______________________________________
Unit 3- Cell Transport NOTES
KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.
Cell membranes are composed of two phospholipid layers.
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The cell membrane has two major functions.
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The cell membrane is made of a ___________________________________________________
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There are other molecules _________________________________________________.
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The ______________________________________ describes the membrane.
• The cell membrane is ___________________________________.
• __________________________________________________________________
Chemical signals are transmitted across the cell membrane.
• Receptors bind with ligands and _____________________________________
• There are two types of receptors.
– ______________________________
– ______________________________
KEY CONCEPT Materials move across membranes because of concentration differences.
Passive transport _________________________________________________________________
• Molecules can move across the __________________________________________________
• There are two types of passive transport.
• ________________________________________
• ________________________________________
• Diffusion and osmosis are types of passive transport.
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• Molecules diffuse down a _________________________________________
• Particles move from a _____________________________________________
• Move until _______________________________________________________
• _________________________________________________
Osmosis
• ________________________________________________________________________
• Diffusion of water through a ________________________________________________
• ________________________________
• ______________________________________________
• ____________________________________________
• 3 types of solution
• ________________________________________________________________
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Some molecules can only diffuse through transport proteins.
• Some molecules cannot easily diffuse across the _____________
• _____________________ is diffusion through transport proteins.
KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.
________________________________ requires _____________________________ from a cell and
enables a cell to move a substance ___________________________________________________
• Passive transport requires ___________________________
• Active transport is __________________________________
• Active transport occurs through ________________________
• Cells use active transport to maintain ___________________
A cell can import and export large materials or large amounts of material in vesicles during the
processes of ___________________________________________
• Cells use energy to transport material in _________________
• _________________________ is the process of
taking material __________________________________
• Phagocytosis is a type of _________________________
• ____________________________________ is the process of ___________________________