Testosterone exerts its biological effects through binding to androgen receptors expressed in multiple tissues, including reproductive organs, muscle, bone, brain, and skin. The density and sensitivity of these receptors determine tissue-specific androgen responses.
Variations in androgen receptor activity influence sexual development, libido, spermatogenesis, and secondary sexual characteristics. Genetic polymorphisms affecting receptor function may explain differences in testosterone sensitivity among individuals with similar hormone levels.
In clinical andrology, recognizing androgen receptor dynamics helps explain cases where symptoms of androgen erotic deficiency occur despite normal circulating testosterone concentrations.
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