Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
Unit 7: Topic 7.2 The Plasma Membrane
Name: _________________________
Period: ________________________
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The Living Environment ’14-‘15
Mr. Murdoch
Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic 7.2 assignments
Pages/Sections
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Date Assigned
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Date Due
Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic:
The Living Environment ’14-‘15
Mr. Murdoch
The Plasma Membrane
Objective: Explain how a cell’s plasma membrane functions.
 All living ____________ must maintain a ____________
regardless of internal and external ____________.
 ____________depends on the cell’s ability to
____________the proper ____________within it.
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic:
The Living Environment ’14-‘15
Mr. Murdoch
The Plasma Membrane
Objective: Explain how a cell membrane assists homeostasis.
 This ____________of maintaining the cell’s environment is
called ____________.
 ____________ ____________is a process used to maintain
homeostasis in which the plasma ____________allows
____________molecules ____________the cell while
keeping ____________ ____________.
 Cells need an ____________& an ____________.
o ____________cell ____________its ____________.
 Cell ____________is the ____________between out and in.
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The Living Environment ’14-‘15
Mr. Murdoch
Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic:
The Plasma Membrane
Objective: Explain why a cell requires permeability.
 Cells need ____________taken ____________and products
or ____________removed ____________.
Materials In
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Materials Out
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic:
The Living Environment ’14-‘15
Mr. Murdoch
Building a Membrane
Objective: Explain the construction of a cell membrane.
 How do you ____________a ____________that keeps the
watery ____________of the ____________separate
____________the watery ____________?
 FATS 
 LIPIDS 
Remember:
oil & water
don’t mix!!
What
substance do
you know that
doesn’t mix
with water?
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
 Membrane is ____________of ____________kind of
____________.
o Phospholipids
 “____________ personality”
 ____________is a ____________layer.
o Phospholipid bilayer
Outside cell
Inside cell
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Topic:
The Living Environment ’14-‘15
Mr. Murdoch
Lipids of a Membrane
Objective: Describe the bi-lipid layer of a membrane
 The ____________ ____________ ____________describes
the plasma ____________as a ____________boundary of a
cell. The phospholipids ____________within the membrane.
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
Topic: Semi-permeable Membrane
Objective: Describe the semi-permeability of a membrane.
 Cell ____________ ____________what gets in or out.
o Need to allow ____________ materials — but
____________ — to ____________through the
membrane.
o ____________ -permeable.
o _________ some material can get ______or ______.
So what needs to get across the membrane?
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
Topic: Semi-permeable Membrane
Objective: Describe the semi-permeability of a membrane.
 ____________molecules can get ____________the cell
membrane ____________?
o ____________and ____________can pass directly
____________.
 But what of other stuff?
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
Topic: Cell Membrane Channels
Objective: Describe passages through cell membranes.
 ____________to make “____________” through membrane.
o Protein ____________allow substances ______ &
______.
o Specific ____________allow ____________material in &
out.
o ____________ channel, ____________channel,
____________ channel, etc.
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
Topic: Cell Membrane Channels
Objective: How do you build a semi-permeable cell membrane?
 Channels ____________made of ____________.
o ____________both “____________” water &
“____________” lipids.
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The Living Environment ’14-‘15
Mr. Murdoch
Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Name: ________________
Period: ____________________
Carefully remove this sheet from your packet to hand in.
Work silently and alone to complete this graded exercise.
Check for Understanding
1. The cellular plasma membrane helps a cell maintain what?
2. Describe the bi-layer structure of a cell membrane.
3. Compare and/or contrast permeability and semipermeability.
Cont’d on back
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
The Living Environment ’14-‘15
Mr. Murdoch
4. What substances may pass directly through the plasma
membrane?
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Unit 2 The Cell – Unit 7 The Cell: 7.2 The Cell Plasma Membrane
Notes page:
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The Living Environment ’14-‘15
Mr. Murdoch