Create an account
movement of solute molecules from an area of greater concentration to an area of lesser concentration
a solution surrounding a cell is hypertonic is
it contains more nonpenetrating solute particles than the interior of the cell
(passive) molecules transported with assistance of protein carrier molecules, small ions cross membrane by moving through water-filled protein channels
flow of water across differentially permeable membrane; concentration of water is inversely related to the concentration of the solutes, cause changes in the volume of the compartments on either side of the membrane
contains more nonpenetrating solute particles than the interior of the cell; water moves down concentration gradient
contains fewer solute particles than interior of the cell; water moves down concentration gradient
requires carrier proteins; primarily driven by ATP or secondary driven by energy store; substances move against concentration gradient; some are amino acids and some sugars
sodium ions are ejected from the cell by this
membranous sac thus formed, phagosome, fused w/ lysosome and contents digested; mainly found among white blood cells and macrophages to help protect body from disease and cancer cells
velocity of molecular movement
-is lower in larger molecules
-increases with increasing temperature
-reflects kinetic energy
what single characteristic of the differentially permeable membranes in lab determine the substances that can pass through them
size of pores in dialysis sac
what other factors influence passage of substances through living membranes
size of molecules, polarity of molecules, concentration gradient
characterize passive processes
-include osmosis, simple diffusion, and filtration
-use hydrostatic pressure or molecular energy as the driving force
-account for the movement of fats and respiratory gases through the plasma membrane
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together