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Cell Transport
7.3
Term | Definition |
---|---|
diffusion | the net movement of a substance from a region of high concentration to a region of low concentration, also referred to as the movement of a substance down a concentration gradient |
facilitated diffusion | passive transport of molecules across a biological membrane through proteins |
isotonic | sport drinks contain similar concentrations of salt and sugar as in the human body |
hypertonic | sport drinks contain a higher concentration of salt and sugar than the human body |
hypotonic | sport drinks contain a lower concentration of salt and sugar than the human body |
osmosis | movement of solvent molecules through a membrane into a region of higher solute concentration, in direction to equalize the solute concentrations on the two sides |
phospholipid bilayer | hydrophilic phosphate heads point “out” to the water on either side and hydrophobic tails point “in” |
selective permeability | biological membrane that will allow certain molecules to pass through it by diffusion and "facilitated diffusion" |