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Mitochondria
Organelles within cells that are the sites of aerobic respiration, providing energy for cellular functions.
Concentration Gradient
A variation in the concentration of a substance across a distance, leading to the movement of particles from an area of high concentration to one of lower concentration.
Carrier Molecules
Proteins that facilitate the transport of substances across a cell membrane without modification of the transported substance.
Facilitated Diffusion
A transport process where molecules pass across cell membranes through protein channels without the expenditure of cellular energy.
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