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Male sex hormone secreted by interstitial cells is:

  • A.Oxytocin
  • B.Testosterone
  • C.Estrogen
  • D.Thyroxine

Answer: B

The hormone is testosterone.

The interstitial cells of the testis, also called Leydig cells, lie between the seminiferous tubules and secrete testosterone under the control of luteinising hormone. Testosterone drives sperm production and male secondary sexual characters.

Oxytocin is released from the posterior pituitary and causes uterine contraction and milk let-down. Estrogen is the main female sex hormone, made by the ovarian follicles. Thyroxine comes from the thyroid gland and controls metabolism.

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