Through which mechanism do steroid hormones typically penetrate target cell membranes?

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Assisted transport via membrane proteinsEndocytosis mediated by specific carriersPassage through cholesterol-rich channels in the membraneDirect movement across the membrane without assistanceActive transport using energy-dependent pumps

Explanation

Steroid hormones are lipophilic molecules that easily cross the lipid bilayer of target cell membranes by simple diffusion, without the need for transport proteins or energy expenditure.