#transport  an exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes
  supertype:  diffusion  (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation
  subtype:  active_transport  transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
  subtype:  passive_transport__passivetransport  transport of a substance across a cell membrane by diffusion; expenditure of energy is not required

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