08 Cell Membranes 2009
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Transcript of 08 Cell Membranes 2009
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Regents Biology 2006-2007
Cell
Membranes
&
Movement Across Them
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Regents Biology
Membran Sel
Memisahkan sel dari lingkungannya
Membran sel adalah perbatasan
Masukmakanan
- gula
- protein- lemak
garam
O2H2O
KeluarZat sisa
- ammonia
- garam- CO2- H2O
hasil
- protein
sel membutuhkan materi yang masuk & hasil atau zat sisa
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Regents Biology
Membangun a membran
How do you build a barrier that keepsthe watery contents of the cell separate
from the watery environment?
What substance
do you know
that doesnt mix
with water?
FATSLIPIDS
Remember:oil & water
dont mix!!
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Lemak dari membran sel
Membran terbuat dari jenis spesial lemak phospholipids
kepribadian ganda
Membrane adalah lapisan ganda
phospholipid bilayer
Sel masuk
Sel keluar
lipid
Ditolak air
Tertarik air
phosphate
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Regents Biology
Membran Semi-permeable
Membran sel mengontrol apa yang masukdan keluar
Perlu memperbolehkan beberapamaterialtapi tidak semuauntukmelewati membran
semi-permeable only some material can get in or out
aa H2Osugar lipids salt wasteO2
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Menyebrangi membran sel
Apa molekul yang dapat melalui membransel secara langsung?
Lemak dan minyak dapat melalui secara
langsung
Sel masuk
Sel keluar
lemakgaram
aa H2Ogula
waste
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Saluran membran sel
Perlu membuat pintu untuk dilalui Saluran protein memperbolehkan zat-zat masuk dan keluar
Saluran khusus memperbolehkan bahan-bahan masuk dan
keluar
Saluran H2O, asaluran garam, saluran gula, danlain-lain
Sel masuk
Sel keluar
gulaaaH2O
garamsisa
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Saluran terbuat dari protein
proteins keduanya menyukai air dan lemak
bi-lipidmembrane
protein channelsin bi-lipid membrane
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Saluran Protein
Proteins sebagai pintu masuk membran Saluran untuk memindahkan molekul
tertentu melalui membran
HIGH
LOW
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Regents Biology
Movement through the channel
Why do molecules move throughmembrane if you give them a channel?
?
?
HIGH
LOW
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Molecules move from high to low
Diffusion move from HIGHto LOWconcentration
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Diffusion
Move from HIGHto LOWconcentration passive transport
no energy needed
diffusion osmosis
diffusion of water
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Simple Diffusion
Move from HIGHto LOW
inside cell
outside cell
Which way
will fat move?fat
fatfat
fat
fatfat fat
fatfat
fat
fatfat
fatfat
LOW
HIGH
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Facilitated Diffusion
Move from HIGHto LOW through a channel
inside cell
outside cell
sugar
sugarsugar
sugar
sugarsugar
sugar sugar
sugar sugarsugar
Which way will
sugar move?
sugarsugar
LOW
HIGH
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Diffusion
Move from HIGHto LOWconcentration directly through membrane
simple diffusion
no energy needed
help through a protein channel
facilitated diffusion(with help)
no energy needed HIGH
LOW
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Simple vs. facilitated diffusion
inside cell
outside cell
lipid inside cell
outside cell
H2O
simple diffusion facilitated diffusion
H2Oprotein channel
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Active transport
Cells may need molecules to moveagainst concentration hill
need to pump uphill
from LOWto HIGHusing energy
protein pump
requires energy
ATPATP
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Regents Biology
Transport summary
simple
diffusion
facilitateddiffusion
active
transport
ATP
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Regents Biology 2006-2007
Osmosis
Movement of Water AcrossCell Membrane
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Osmosis
Water is very important, so we talk aboutwater separately
Osmosis
diffusion of water from HIGH concentrationof water to LOW concentration of water
across a semi-permeable membrane
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Keeping water balance
Cell survival depends on balancingwater uptake & water loss
freshwater balanced saltwater
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Keeping right amount of water in cell
Freshwater a cell in fresh water
high concentration of wateraround cell
cell gains water example: Paramecium
problem: cells gain water,
swell & can burst
water continually enters
Parameciumcell
solution: contractile vacuole
pumps water out of cell
freshwater
No problem,here
KABOOM!
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Controlling water
Contractile vacuole in Paramecium
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Keeping right amount of water in cell
Saltwater a cell in salt water
low concentration of wateraround cell cell loses water
example: shellfish
problem: cell loses water
in plants: plasmolysis in animals: shrinking cell
solution: take up water
saltwater
I willsurvive!
Im shrinking,Im shrinking!
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Keeping right amount of water in cell
Balanced conditions no difference in
concentration of waterbetween cell & environment
cell in equilibrium
example:blood
problem: none
water flows acrossmembrane equally,in both directions
volume of cell doesntchange
balanced
I couldbe better
Thatsbetter!
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Ice Fishing in Barrow
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