Membrane Structure. Review: Phospholipid structure and properties *amphipathic.

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Presentation transcript:

Membrane Structure

Review: Phospholipid structure and properties *amphipathic

Membrane Models: 1935 Today Cell biology at work: membranes “uncovered” *Membranes are fluid

Membranes are fluid

*Some functions of membrane proteins: Transport Enzymatic activity Signal transduction Intercellular junction Cell recognition Anchors

Membrane Transport *Channel protein *Carrier protein

Traffic across membranes *Passive transport *Active transport Passive transport *Selective permeability *Diffusion

Osmosis is the passive transport of water When comparing two solutions: *hypertonic *hypotonic *isotonic

Passive transport Facilitated diffusion Channel proteins and carrier proteins *Each cell membrane has characteristic set of carrier proteins

*Active transport Example: sodium-potassium pump

Electrogenic pump: *Some ion pumps generate voltage across membranes *Voltage *Membrane potential

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