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17 Cards in this Set

  • Front
  • Back
Membrane Structure
*bilayer
*seperate intracellular fluid/extracellular
*physical - center part made up of hydrophobic lipids
Membrane Structure
-Phospholipids
*membrane backbone
*soap-like
*fluidity-flexible/lateral mobility within the membrance
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
Membrane Strcuture
-cholesterol
*very fat soluble
*in all membranes
*fits between fatty acids, creates stability and fluidity
Membrane Structure
-proteins
*in membranes
*some mobile, some restricted
Membrane Structures
-Proteins
-Channels
*only ions will pass
*channels span membrane[open/closed]
*each channel is specialized(K+, Na+, Ca+, Cl-)-controlled by receptors
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
Membrane Structures
-Proteins
-Docking-marker Acceptors
*bind to proteins on exocytotic vesciles
Membrane Structures
-Proteins
-Enzymes
*catalyze reaction
*inside-signaling
*outside-digestive enzymes
*some enzymes are always active, some activated occasionally, and almost always by receptors
Membrane Structures
-Proteins
-Receptors
*on outside-receive agonist
Membrane Structures
-Proteins
-Cell Adhesion Molecules
*CAM's
*extend extracellular side
*anchor adjacent cell
*decrease CAM's metastatic cancer
Membrane Structures
-Carbohydrate-Protein complexes
*identify "self" to the immune system
*seperate cells during embryomic growth
*confine cell types to one region
Intracellular connections
*protein polymers in interstitial fluid
*collogen, elastin, fibronection
Intracellular connections
-CAMs
*anchored to cell membranes
Intracellular connections
-Tight Junctions
*block movement between cells
*create tissue sideness
*important in skin, intestines, kidneys
*transport must go through cells
Intracellular connections
-desmosomes
*cellular rivets, very strong
*anchor adjacent cells under force
*important in heart, skin, digestive track, uterus, bladder
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