Monday, March 23, 2009

Biology ~ Passive transport and active transport

THE MOVEMENTS OF SUBSTANCES ACROSS PLASMA MEMBRANE

1.Passive transport
• Simple diffusion
• Facilitated diffusion
• Osmosis
-no require energy

2.Active transport
- require energy


DEFINITION (IMPORTANT!!)

~ SIMPLE DIFFUSION



• movement of substances such as oxygen and lipid soluble
• from higher concentration region to the lower concentration region
• across the plasma membrane or not


~ OSMOSIS



• movement of water
• from lower concentration region to the higher concentration region
• across the plasma membrane


~ FACILITATED DIFFUSION






• transport of substances such as non-soluble substance, ion and large molecules
• from higher concentration region to the lower concentration region
• through carrier protein













~ ACTIVE TRANSPORT




















• movement of substances such as ion at root hair, glucose and amino acid
• from lower concentration region to the higher concentration region
• with the use of energy in the form of ATP


THE FLASH PLAYER

YOU MUST TRY IT!! VERY INTERSTING!

http://www.northland.cc.mn.us/biology/biology1111/animations/passive4.swf






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