= net movement of particles from an area of high concentration to an area of low concentration
Takes place because of random movement of particles of gas or substance in solution with water so requires no energy
The bigger the concentration gradient the faster the rate of diffusion
Examples of diffusion in living organisms...
v Oxygen diffuses from alveoli in lungs into blood and from blood into respiring cells
v Carbon dioxide diffuses out of respiring cells into blood and from blood into alveoli in lungs
v Food molecules diffuse from small intestine into blood and from blood into body cells
v Carbon dioxide diffuses from air into plant leaf cells
Comments
No comments have yet been made