Osmosis, Diffusion and Active transportWatch
Diffusion - The net movement of molecules from an area of higher concentration into an area of lower concentration. eg - perfume spreading out in the air
Active transport - The net movement of molecules against a concentration gradient using energy released from respiration - nutrients from blood into gut
Diffusion is the net movement of particles from an area of high concentration to low concentration, or down a concentration gradient. It is a passive process therefore does not require energy from ATP.
There are different types of diffusion including facilitated e.g. through a protein gated channel.
Osmosis is a type of diffusion whereby water molecules move from a high concentration of water to a low concentration of water, again a passive process, through a partially permeable membrane.
Active transport is basically the opposite of diffusion whereby particles move from an area of low concentration to high concentration, e.g. against a concentration gradient and requires energy from ATP, assisted by enzymes.
Hope this helps.
Osmosis - diffusion of water particles
Active transport - the movement of particles against a concentration gradient