The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ______.

Question

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Facilitated diffusion allows substances to move across a semipermeable membrane from higher to lower concentration without the need for energy expenditure, but protein carriers are required to assist in the transport. This process is distinct from active transport, which requires energy input, diffusion, which does not require protein carriers, endocytosis, which involves the uptake of external materials by engulfing them in a membrane-bound vesicle, and osmosis, which specifically refers to the movement of water across a membrane.

The Movement of Substances from Higher to Lower Concentration Across