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8/17/2019 Ch 15. Phospholipids
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Chapter 1515.5 Phospholipids
15.7. Cell Membranes
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What are
Phospholipids?1 x Glycerol (polar)
2 x atty !cid (non"polar)
1 x Phosphoric !cid# $%P&' and
amino alcohol (polar)
ormin a phosphodiester bond *ith lycerol andamino alcohol
Gl cero hos holi ids
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!mino !lcohols
+ ,hree aminoalcohols o-nd inlycerophospholipi
ds are#
choline ethanolamine serine
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Characteristics oPhospholipids
• Phospholipids are aliphatic molec-les#polar and non"polar at the same time. Canact as..
1. /oaps2. 0m-lsiyers
%. arriers membranes
Polar non"polar
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ecithins3Cephalins are
phosholipids o-nd in•rain34ere tiss-e
• 0 yol6#
sed to em-lsiy the inredients
in do-h# at (non"polar) s-ar8mil68 *ater (polar)
0m-lsi9cation# blendin o ats*ith *ater to orm ahomoeneo-s mixt-re called anem-lsion
,ypical em-lsions# mil68 lotion8
do-h
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Cell Membranes
•Composed o a PhospholipidBilayer
• Polar head : nonpolar tailsro-p toether
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ipid ilayer
•;o-ble ro* arranemento phospholipids
•$ydrophilic polarheads ace the*ater phase
(blood3cytosol)•$ydrophobic
nonpolar tailsmoe to center
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l-id Mosaic Model ,heory oMembranes
+ Semipermeable# some s-bstancescan cross the membrane bys<-ee=in bet*een phospholipids or
-se channel molec-les+ Fluidity is essential and is re-lated
by ad>-stin sat-rated3-nsat-rated
! contents dependin to temprane. Cholesterol molec-les 6eepmembranes -id. ! solidi9edmembrane is @deadA
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• Mosaic: composed o phospholipids8proteins8 cholesterol
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$eart !ttac6raphics heart attac6
$eart !ttac6 timeline and story
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ipitor commercial
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