Scence transport

facilitated diffusion

transport of ions or molecules across a membrane by means of a membrane protein along the concentration gradient for that ion or molecule

channel protein

create pores or channels through which small water-soluble particles are able to move

Cystic Fibrosis

Caused by defective chloride ion channel proteins that do not allow the

proper movement of Cl-, across the cell membrane

carrier proteins

membrane protein that binds to and transports one or more

particles of a substance from one side of the membrane to the other, along the concentration gradient

active transport

the movement of substances through a membrane against a

concentration gradient using membrane-bound carrier proteins and energy from ATP

ATP

the source of energy for use and storage at the cellular level

Active Transport: Protein Pumps

a protein pump moves material against the concentration

gradient

membrane-assisted transport

transport method used to move materials that are too large to cross the cell membrane through a channel or carrier protein