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### Study guide Quiz #1 - Cell membrane (Plasma) - Outer boundary of the cell - Maintains integrity of cell - Flexible, thin, elastic - Separates intracellular fluid (cytosol) from extracellular fluid - Selectively permeable: regulates entry and exit of substances - Signal t...

### Study guide Quiz #1 - Cell membrane (Plasma) - Outer boundary of the cell - Maintains integrity of cell - Flexible, thin, elastic - Separates intracellular fluid (cytosol) from extracellular fluid - Selectively permeable: regulates entry and exit of substances - Signal transduction: permits cell to receive and respond to messages - Consists mainly of lipids and proteins, with some carbohydrates - Phospholipid bilayer: cell membrane framework - Cholesterol: stabilizes membrane, helps keep it impermeable to water-soluble substances ### Membrane Potential - Ion channels: integral proteins that span the width of the cell membrane - Protein subunits undergo conformational changes to form an open channel or gate - Through which ions can move. Sodium, potassium, calcium or chloride ions - Electrical potentials exit across the membranes as a result of ion distribution.