Cell Membrane 100 online.ppt

7/25/2019 Cell Membrane 100 online.ppt

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Plasma Membrane

Structure andFunction

Chapter 4


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Outline

Phospholipid Bilayer Fluid Mosaic Model

Membrane Proteins

Diffusion

Facilitated Diffusion

Osmosis Bulk Transport

cti!e Transport


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Membrane Functions

Protection

Communication

Selecti!ely allo" substances in #espond to en!ironment

#eco$nition


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Plasma Membrane

Boundary that separates the living cellfrom it%s

non-livingsurroundin$s&

Phospholipid bilayer

Amphipathic' ha!in$ both(

hydrophilic heads

hydrophobic tails

)* nm thick

+s a dynamic structure

PhospholipidPhospholipid
http://www.d.umn.edu/~sdowning/Membranes/phospholipidlateralmovanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/phospholipidlateralmovanim.html


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Fluid'Mosaic Model
http://www.youtube.com/watch?v=Qqsf_UJcfBc&mode=user&search=http://telstar.ote.cmu.edu/biology/animation/Membranes/membranes.htmlhttp://www.youtube.com/watch?v=Qqsf_UJcfBc&mode=user&search=


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Proteins,For Function

Transport

#eceptors

-n.ymes

Si$nal Transducers

Support


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PROTEINS CA

N MOVE IN THE MEMBRANE

, TOO!

Plasma Membrane Proteins
http://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.htmlhttp://www.d.umn.edu/~sdowning/Membranes/proteinmobilityanim.html


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Channel protein


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Carrier protein


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Cell reco$nition protein


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#eceptor protein


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-n.ymatic protein

Exampleof

Enzymaticactiityaociate"

#it$ amem%&ane'

G-proteiG-protei

()PROTEINANIMATION*

G-protein anG-protein animation 3imation 3
http://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/signals.htmhttp://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/signals.htmhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://www.sp.uconn.edu/~bi107vc/images/anim/SigtranRA.gifhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://entochem.tamu.edu/G-Protein/index.htmlhttp://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/signals.htmhttp://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/signals.htm


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Permeability of the Cell Membrane'

+ie&entially Pe&mea%le+ie&entially Pe&mea%le


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Permeability of the Cell Membrane


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Diffusion

/ the passivemo!ement of molecules from

a hi$her to a lo"er concentration untilequilibriumis reached&

/ 0o" can "e e1plain diffusion2

/ 3ases mo!e throu$h plasma membranesby diffusion&

Osmosis/ special case of diffusion

D+FFS+O5


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Process of diffusion


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3as e1chan$e in lun$s by diffusion


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Osmosis

The diffusion of "ater across a

differentially permeable

membrane due toconcentration differences


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Question:

Whats in a Solution?Answer:

solute 6 solvent

solution

a!l 6 "#$ saltwater


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TO5+C+T7

#efers to the concentration of

S%&'()S

+s a*)&A(+,) term8 comparin$ t"odifferent solutions

0ypertonic

0ypotonic

+sotonic


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"ypertonic

solution"ith a greater solute

concentrationcompared to another solution&

. a!l

/0. "#%

*ed 1lood !ell

2. a!l

/2. "#%

solutionsolution

-$ic$#ay

#illt$e#ate&moe

.


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"ypotonic

solution"ith a lower solute concentration

compared to another solution&

. a

/0. "#%

*ed 1lood !ell

3. a

//. "#%

solutionsolution

-$ic$#ay

#illt$e#ate&moe

.


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+sotonic

solution"ith an e4ual solute concentration

compared to another solution&

. a

/0. "#%

*ed 1lood !ell

. a/0. "#%

solutionsolution

-$ic$#ay

#illt$e#ate&moe

.


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+SOTO5+C SO9T+O5


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07POTO5+C SO9T+O5


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07P-#TO5+C SO9T+O5


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Function,Transport& re specific8

combine "ith only a certain type of

molecule& Types

/Facilitated transport''passi!e

/cti!e transport,re:uires ener$y

Carrier Proteins


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Facilitated Transport
http://www.d.umn.edu/~sdowning/Membranes/diffusionanimation.htmlhttp://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htmhttp://www.d.umn.edu/~sdowning/Membranes/diffusionanimation.html


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cti!e Transport
http://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htmhttp://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htm


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The sodium'potassium pump

- t i d


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-1ocytosis'''Cellular secretion

-ndocytosis,

/Pha$ocytosis, ;Cell eatin$

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Cell Membrane 100 online.ppt