Some substances are allowed to pas through and others cannot. The cell membrane is this.
Molecules move through the cell membrane from an area of higher concentration to lower concentration.
WATER molocules use diffusion to move across a selectivly permeable cell membrane. (higher to lower concentration)
When molecules are transported WITHOUT USING cellular energy.
When molecules are transported while USING cellular energy.
types of passive transport
osmosis and diffusion
types of active transport
carrier proteins and engulfing
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
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.
Your microphone is muted
For help fixing this issue, see this FAQ.