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17 Cards in this Set
- Front
- Back
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Functions of Plasma Membrane (phospholipid bilayer)
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Physical Isolation, Regulation of Exchange of Outside Environment, Sensitivity, Cell to cell communication.
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Plasma Membrane Composition
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Phospholipids, Proteins, glycolipids, sterols.
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Phospholipid Bilayer composition
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Heads at surface (hydrophilic), tails inward (hydrophobic),
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What cant cross the pm?
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Dissolved Ions, water soluble compounds. (tail portion wont associate)
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two membrane proteins
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Peripheral, Integral
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Peripheral Protein in pm
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attached to inner or outer membrane surface
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integral protein in pm
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embedded into pm
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Integral proteins form?
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Channels....some are gated |
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Carbohydrate portion of glycolipid and glycoproteins that extend away from outer surface of pm make the???????
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Glycocalyx
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Function of sterols. what is an example?
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help stabilize membrane structure and maintain its fluidity. ex. Cholesterol |
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permeability. impermeable . freely permeable. Selectively permeable
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Property determining the effectiveness of it as a barrier. nothing can cross = impermeable can cross without problem = freely impermeable selectively permeable = some can some cant |
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3 passive passage processes 3 active passage process |
active- active transport, endocytosis, exocytosis |
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Microvilli. where are they found?
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found in cells actively engaged in absorbing materials from extracellular fluid. ex cells from kidneys and small intestines. |
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Purpose of microvilli.
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increase surface area for greater absorption, |
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composition of Microvilli. Microfilaments and microvilli interaction.
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network of microfilaments stiffens each microvillus and anchors it to terminal web ( dense supporting network within underlying cytoskeleton) |
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microfilaments and cytoskeleton interaction.
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produce waving motions. help circulate fluid around microvilli, bringing dissolved nutrients into contact with receptors on membrane surface. |
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