7.2 plasma membrane. 7.2 the plasma membrane what you will learn: -how a cell’s plasma membrane...
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7.2 PLASMA MEMBRANE
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7.2 THE PLASMA MEMBRANE
WHAT YOU WILL LEARN: -how a cell’s plasma membrane functions -the roles of proteins, carbohydrates &
cholesterol in the plasma membrane
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READING QUESTIONS1-HIGHLIGHT the items in the figure that
enter the cell thru pm/CIRCLE those that exit the cell
oxygen
glucose
water
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READING QUESTIONS2-EXPLAIN the purpose of phospholipid
bilayer?-allows plasma membrane to survive & function in its watery environment
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READING QUESTIONS3-IDENTIFY: CIRCLE one phospholipid—
LABEL its head/tail
headtail
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READING QUESTIONS4-DEFINE the role of transport proteins
5-NAME 3 substances that move among the phospholipids of the PM
-move substances through plasma membrane
-proteins/carbohydrates/cholesterol
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• http://www.dnatube.com/video/360/Fluid-Mosaic-Model
• http://www.susanahalpine.com/anim/Life/memb.htm
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REVIEW -homeostasis:-maintain balance / internal environment
7.2 THE PLASMA MEMBRANE
http://www.dnatube.com/video/360/Fluid-Mosaic-Model
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selective permeability-- -CONTROLS substances ENTER / LEAVE (homeostasis)
WHAT WHEN HOW *cells must keep proper concentration of nutrients / water / expel
waste
-some molecules can cross the plasma membrane --(water)-others must go through channels --(Na, Ca, etc)
This is like a FISH NET--HOW?T/P/S: analogy for a cell’s selective permeability
FUNCTION of the PLASMA MEMBRANE
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FUNCTION of the PLASMA MEMBRANEFUNCTION of PLASMA MEMBRANE-boundary separates cell & environment -allows water, nutrients & oxygen into
cell -allows waste & CO2 out of cellOUTSIDE CELL
INSIDE CELL
NUTRIENTSOXYGEN
WASTE
CARBON DIOXIDE
WATER
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polar head— hydrophilic …likes water
non-polar tail—hydrophobic …repels water
STRUCTURE of PLASMA MEMBRANE
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STRUCTURE of PLASMA MEMBRANE
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A- carbohydrate chain
B- transport protein
C- polar heads
D- non-polar tails
E-cholesterol
STRUCTURE of PLASMA MEMBRANE
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B- lipids C- phospholipid A- transport protein F- phospholipid bilayer D- fluid mosaic model E- selective permeability
STRUCTURE of PLASMA MEMBRANE
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FUNCTION of the PLASMA MEMBRANEDESCRIPTION SELECTIVE
PERMEABILITY
HOMEOSTATSIS
PLASMA MEMBRANE
1-The process of maintaining balance inside a cell.2-A boundary between a cell & its environment.3-Feature of plasma membrane that keeps some substances out.4-Separates prokaryotic & eukaryotic cells from the watery environment in which they exist5-The quality of a plasma membrane that allows oxygen & glucose to move in6-Maintained by the plasma membrane
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-polar headsbarrier to water environment in/out of cell
-non-polar tailsprevent substances dissolve in water from passing thru PM
-carbohydrate chainidentify chemical signals from environment
-cholesterolprevent tails from sticking together, keep membrane fluid
-transport proteinlike tunnels--move materials thru plasma membrane
-membrane proteinreceptors—on outside, send signals to inside of cellanchors—on inside, hold membrane to cell’s internal shape
STRUCTURE of PLASMA MEMBRANE
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EXPLAIN/DRAW
1-MEMBRANE PROTEIN -create tunnels -PASSIVE
2-TRANSPORT PROTEIN -create tunnels -”pump” substances / ACTIVE
STRUCTURE of PLASMA MEMBRANE
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EXPLAIN/DRAW
CHOLESTEROL -non polar -keeps PM fluid--prevents fatty acid tails from sticking -maintains homeostasis in cell
CARBOHYDRATE CHAIN -help cell identify chemical signals from environment
STRUCTURE of PLASMA MEMBRANE
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FLUID MOSAIC MODEL
This “MODEL” for the structure of the membrane is called the:
FLUID MOSAIC MODELFLUID-individual phospholipids / proteins move freely within the
layer-- like a liquidMOSAIC-“pattern” produced by the scattered protein molecules
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AS Biology. Foundation. Cell membranes and Transport 22
Cell Membranes from Opposing Neurons (TEM x436,740).
} cell membrane
7nm wideCell membrane {
Nerve cell
Nerve cell
Gap between cells