Intoducing... DIFFUSION!

What is it?
It is the random movement of molecules of a substance from a region of higher concentration to a region of lower concentration down the concentration gradient.

IMPORTANCE OF DIFFUSION

• Living organisms obtain many of their requirements and get rid of their toxic metabolic products by diffusion.
• Plants need carbon dioxide for photosynthesis and carbon dioxide molecules requires diffusion to enter the leaf through the stomata.
• Oxygen, a waste product of photosynthesis diffuses out the leaves by diffusion.
• Respiration in animals require oxygen. Oxygen in inhaled air dissolves in the moisture lining the alveoli of the lungs, then moves through the walls of the alveoli into the blood by diffusion.
• Some of the end products of digestion or nutrients are absorbed from the ileum of mammals by diffusion.
• Absorption of some mineral nutrients by roots.