Testosterone is the principal androgen responsible for male reproductive development, sexual function, and systemic physiological regulation. Synthesized primarily by Leydig cells in the testes, testosterone production is regulated by the hypothalamic–pituitary–gonadal (HPG) axis. Luteinizing hormone (LH), secreted by the anterior pituitary gland, stimulates Leydig cells to produce testosterone from cholesterol through enzymatic conversion pathways.
Circulating testosterone exists in three forms: bound to sex hormone-binding globulin (SHBG), loosely bound to albumin, and free (biologically active). Only free and albumin-bound testosterone are considered bioavailable.
Testosterone influences spermatogenesis, libido, muscle mass, bone density, erythropoiesis, and mood regulation. Declining testosterone levels may result from aging, obesity, chronic disease, or pituitary dysfunction.
Clinical evaluation includes morning serum testosterone measurement, repeated for confirmation. Additional hormonal testing may include LH, follicle-stimulating hormone (FSH), and prolactin. Testosterone replacement therapy (TRT) may be administered via injections, transdermal gels, or subcutaneous implants, with careful monitoring for adverse effects.
A comprehensive understanding of testosterone biology is fundamental in diagnosing and managing hypogonadism and erotic related disorders.
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