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how does cholesterol impact fluidity?
the more cholesterol, the less fluid
how does tail length impact fluidity?
the longer the tail, the less fluid
aquaporins
water channels within a membrane
membrane receptors
bind to signaling molecules
membrane carriers
bind to substances to move them across the membrane
membrane gated channels
channels that can open and close
membrane channels
a “pore” with a selective passageway
integral membrane proteins
membranes embedded in the membrane, amphipathic
peripheral membrane proteins
proteins which lay along the membrane
what influences the membrane’s fluidity?
temperature, degree of saturation of fatty acid tails, tail length, presence of cholesterol
leaflet
one side of the phospholipid bilayer
phospholipid bilayer
heads face opposite directions (polar + hydrophilic), tails face the same direction (nonpolar + hydrophobic), has a hydrophobic core
amphipathic
when a substance has both polar and nonpolar regions
the 3 mains functions of plasma membranes
isolate the interior cell parts from the outer parts, regulate the passage of materials, and mediate cell-cell interactions
plasma membrane
the outer surface of a cell, mostly made of phospholipids, are amphipathic
