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17 Cards in this Set
- Front
- Back
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Membrane Structure
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*bilayer
*seperate intracellular fluid/extracellular *physical - center part made up of hydrophobic lipids |
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Membrane Structure
-Phospholipids |
*membrane backbone
*soap-like *fluidity-flexible/lateral mobility within the membrance |
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Membrane Strucutre
-Phospholipids -Hydrophobic/Hydrophilic |
*hydrophobic-fatty acid chainds
hydrophilic-glycerol-phosphate *hydrophobic molecules will cross easily *hydrophilic(very fat soluble) molecules(water soluble areas)-dont cross by diffusion |
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Membrane Strcuture
-cholesterol |
*very fat soluble
*in all membranes *fits between fatty acids, creates stability and fluidity |
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Membrane Structure
-proteins |
*in membranes
*some mobile, some restricted |
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Membrane Structures
-Proteins -Channels |
*only ions will pass
*channels span membrane[open/closed] *each channel is specialized(K+, Na+, Ca+, Cl-)-controlled by receptors |
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Membrane Structures
-Proteins -Carriers |
*"revolving" protins
*move molecules[sugars, amino acids] down gradient(high to low concen) *cotransport of molecule as Na+ goes down its gradient |
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Membrane Structures
-Proteins -Docking-marker Acceptors |
*bind to proteins on exocytotic vesciles
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Membrane Structures
-Proteins -Enzymes |
*catalyze reaction
*inside-signaling *outside-digestive enzymes *some enzymes are always active, some activated occasionally, and almost always by receptors |
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Membrane Structures
-Proteins -Receptors |
*on outside-receive agonist
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Membrane Structures
-Proteins -Cell Adhesion Molecules |
*CAM's
*extend extracellular side *anchor adjacent cell *decrease CAM's metastatic cancer |
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Membrane Structures
-Carbohydrate-Protein complexes |
*identify "self" to the immune system
*seperate cells during embryomic growth *confine cell types to one region |
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Intracellular connections
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*protein polymers in interstitial fluid
*collogen, elastin, fibronection |
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Intracellular connections
-CAMs |
*anchored to cell membranes
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Intracellular connections
-Tight Junctions |
*block movement between cells
*create tissue sideness *important in skin, intestines, kidneys *transport must go through cells |
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Intracellular connections
-desmosomes |
*cellular rivets, very strong
*anchor adjacent cells under force *important in heart, skin, digestive track, uterus, bladder |
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intracellular connections
-gap juctions |
*channels between cells
*allow ions to pass (and some smalllll molecules) *allow electrical signals to pass cell to cell *present in heart, some smooth muscles, and uterus |
