What stimulates the gonads in male at 8 week to secret testosterone -: (A) Inhibin from corpus luteum, (B) GnRH from hypothalamus of baby, (C) Placental HCG, (D) All of above
Answer is C. Ans. is 'c' i.e., Placental HCG During embryogenesis, In male embryo, at 6-7 week of gestatin, secretion of first anti-mullerian hormone (also k/o mullerian inhibiting substance) causes regression of mullerian duct. Then at 8-12 week, under influence of Placental HCG, testes staed producing testosterone.