What is the difference between diffusion and facilitated diffusion?

transport of substances across a biological membrane through a concentration gradient

Explanation:

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Main Difference – Simple Diffusion vs Facilitated Diffusion Simple diffusion and facilitated diffusion are two types of passive transport methods in which the cell membrane transports molecules across it. It uses natural entropy to move molecules from higher concentration to a lower concentration until the concentration becomes equalized. Hence, no ATP energy is used for the transportation of molecules. There are four main types of passive transport: osmosis, simple diffusion, facilitated diffusion and filtration. The main difference between simple diffusion and facilitated diffusion is that simple diffusion is an unassisted type of diffusion in which a particle moves from higher to a lower concentration across a membrane whereas facilitated diffusion is the transport of substances across a biological membrane through a concentration gradient by means of a carrier molecule.

Simple diffusion is the movement of molecules through a cell membrane, whilst facilitated diffusion is the movement of molecules through channels formed by the integral membrane protein.

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