What is the name of the process by which molecules move across a membrane?
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Understanding: • Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport
Passive Transport Passive transport involves the movement of material along a concentration gradient (high concentration ⇒ low concentration) Because materials are moving down a concentration gradient, it does not require the expenditure of energy (ATP hydrolysis) There are three main types of passive transport:
Active Transport Active transport involves the movement of materials against a concentration gradient (low concentration ⇒ high concentration) Because materials are moving against the gradient, it requires the expenditure of energy (e.g. ATP hydrolysis) There are two main types of active transport:
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