what is the cell membrane? aka: plasma membrane the boundary between the cell and the environment...
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What is the cell membrane?AKA: Plasma membraneThe boundary between the cell and the
environmentDoes every cell have a cell membrane?
Yes!, Each and every cell has a cell membrane.
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How do cell membranes help to maintain homeostasis?
The cell membrane allows nutrients to come into the cell
Glucose, amino acids, lipids
The cell membrane removes waste
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Selective PermeabilityThe cell membrane lets some molecules in
and keeps others out
EX. A cell is low on glucose so the membrane lets in some glucose, but does not overfill the cell with the monomer.
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Structure of the cell membraneWhat does the cell membrane look like up
close?
Lets look at one of these
structures up close
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Structure of cell membranePhospholipids
Phosphate headGlycerol2 Fatty acid tails
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Phospholipids1.) Phosphate Head
Polar Hydrophilic Make up the outer borders of the
membrane
2.) Fatty Acid Tails Nonpolar Hydrophobic Make up the inner part of the
membrane
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Structure of cell membranePhospholipid bilayer
2 layers of phospholipids make up a cell membrane
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Phospholipid BilayerRemember polar heads and nonpolar tails
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The fluid Mosaic Model of the cell membraneLipid bilayer is not strong & firm
like a hard shell, but it is fluid like a soap bubble consistency
So, it is called the Fluid Mosaic Model (fluid like, with many proteins stuck in it)
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The fluid Mosaic Model of the cell membrane
It is a flexible membrane, made fluid because of cholesterol molecules located in the phospholipid bilayer.
Proteins in the membrane move around.
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Other components of the cell membraneCholesterol
Helps to stabilize the phospholipids and keep them from sticking together
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Other components of the cell membraneCarbohydrates- linked to lipids or proteins
Recognition of Cells – “Name tag of cell”Ex. Is the cell a heart cell, liver cell, or brain cell?Ex. Glycolipids & Glycoproteins (marker protein)
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Other components of the cell membrane
Proteins- make up 50 %- 70% of membraneRegulate which molecules enter
and which molecules leave a cell.Receive info & ID the cell
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Types of proteins in the cell membraneCarrier Protein
Allow needed substances or waste materials to move through the cell membrane
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Types of proteins in the cell membraneReceptor Protein
These have binding sites for molecules such as hormones or substrates to bind to that can cause a chemical rxn in the cell
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Types of proteins in the cell membraneChannel or Pore protein
Hydrophilic channel – allows lipid insoluble substances to pass in and out of cell.
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Types of proteins in the cell membraneGlycoproteins
Protein with what macromolecule attached to it? Carbohydrate
Functions for cell to cell recognition
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Where are proteins located in the cell membrane?
Integral ProteinsProteins inside the cell membrane
Peripheral ProteinsProteins outside the cell membrane
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Lets build a cell membrane togetherhttp://www.wisc-online.com/objects/
index_tj.asp?objid=AP1101 Cell membrane animation
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Cell membranes help maintain homeostasis, what is that?
Cel
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Cel
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Cel
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aint
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Cel
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produc
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25% 25%25%25%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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1. Cells breathing2. Cells getting blood
to them3. Cells maintaining
internal conditions4. Cells reproducing
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Where would you expect to find water in this cell membrane?
Her
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ere
50%50%
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1. Here2. Here
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When something is hydrophilic, it…
Has
a c
hemic
al...
Has
a c
hemic
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50%50%
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1. Has a chemical makeup that likes to be around water
2. Has a chemical makeup that does not like to be around water
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This picture shows what type of protein?
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Chan
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Gly
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Car
rier P
rote
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25% 25%25%25%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
1. Receptor Protein2. Channel Protein3. Glycoprotein4. Carrier Protein
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Identify the structure marked on the cell membrane:
Phosp
holipid
Chole
ster
ol
Rec
epto
r pro
te...
Chan
nel p
rote
i...
Gly
copro
tein
Car
rier p
rote
i...
Nucl
eic
acid
14% 14% 14% 14%14%14%14%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
1. Phospholipid2. Cholesterol3. Receptor protein4. Channel protein5. Glycoprotein6. Carrier protein7. Nucleic acid
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Identify the structure marked on the cell membrane:
Phosp
holipid
Chole
ster
ol
Rec
epto
r pro
te...
Chan
nel p
rote
i...
Gly
copro
tein
Car
rier p
rote
i...
Nucl
eic
acid
14% 14% 14% 14%14%14%14%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
1. Phospholipid2. Cholesterol3. Receptor protein4. Channel protein5. Glycoprotein6. Carrier protein7. Nucleic acid
![Page 27: What is the cell membrane? AKA: Plasma membrane The boundary between the cell and the environment Does every cell have a cell membrane? Yes!, Each and](https://reader036.vdocuments.net/reader036/viewer/2022062409/5697bf821a28abf838c85bbf/html5/thumbnails/27.jpg)
Identify the structure marked on the cell membrane:
Phosp
holipid
Chole
ster
ol
Rec
epto
r pro
te...
Chan
nel p
rote
i...
Gly
copro
tein
Car
rier p
rote
i...
Nucl
eic
acid
14% 14% 14% 14%14%14%14%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
1. Phospholipid2. Cholesterol3. Receptor protein4. Channel protein5. Glycoprotein6. Carrier protein7. Nucleic acid
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Identify the structure marked on the cell membrane:
Per
ipher
al P
ro...
Inte
gral P
rote
...
50%50%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
1. Peripheral Protein2. Integral Protein