SUBSTANCES MOVE BY DIFFUSION, OSMOSIS AND ACTIVE TRANSPORT
Osmosis = the movement of water from a lower concentration to a higher concentration through a partially permeable membrane - from a dilute solution to a concentrated solution.
Diffusion = the movement of particles or molecules along a concentration gradient - from a region of higher to lower concentration
Active Transport = the movement of particles or molecules against a concentration gradient - from an area of lower concentration to an area of higher concentration which requires energy. (Opposite direction of diffusion)
- life processes need gases or other dissolved substances before they can happen
- waste substances also need to move out of the cells so organisms can get rid of them
- in life processes, the gases and dissolved substances have to move through some sort of exchange surface. The exchange surface structures have to…