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Facilitated diffusion requires. enzymes. carrier proteins. lipid carriers. carbohydrate carriers. lipid or carbohydrate carriers. 2. Facilitated diffusion occurs. into the cell only. out of the cell only.
Carrier proteins are important for transport of many types of substances across both external and internal cell membranes. 1  Simple, Fick's Law, diffusion, down a concentration gradient from high to low concentration, is only found for small hydrophobic molecules, such as steroid hormones, and gases.. 1  Simple, Fick's Law, diffusion, down a concentration gradient from high to low concentration, is only found for small hydrophobic molecules, such as steroid hormones, and gases. 2  These substances move across membranes without the aid of a protein channel.