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Ch 7

Terms in this set (19)

boundary that seperates the living cell from its surroundings.
plasma membrane
determines most of the membranes specific functions.
proteins
bound to the surface of the membrane
perpheral proteins
allows passage of hydrophilic substances across the membrane.
transport proteins
penetrate the hydrophobic core.
integral proteins
the diffusion of a substance across a biological membrane .
passive transport
moves substances against their concentrations gradients. requires energy usually in the form of atp
active transport
the tendency for molecules to spread out evenly into the available space.
diffusion
solute concentration is greater than that inside the cell;cell loses water
hypertonic solution
the ability of a surrounding solution to cause a cell to gain or lose water.
tonicity
transport proteins speed the passive movement of molecules across the plasma membrane.
facilitated diffusion
solute concentration is the same as that inside the cell; no net water across the plasma membrane.
isotonic solution
the cell takes in macromolecules by forming vesicles from the plasma membrane.
endocytosis
transport vesicles migrate to membrane, fuse with it rebase their contents.
exocytosis
the control of solute concentration and water balance.
osmoregulation
diffusion, osmosis, facilitated diffusion.
examples of passive transports?
transport, cell recognition, enzymatic activity, signal transduction, intercellular joining, attachment to the cytoskeleton and extracellular matrix (ECM)
6 major functions of membrane proteins are what?
cell gains water
hypotonic solution
osmosis
the diffusion of water across a selectively permeable membrane
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