Question

1. The hormones that trigger the beginning of puberty are

A) estrogen, progesterone and prolactin

B) progesterone, estrogen, prolactin and testosterone

C) progesterone, estrogen and testosterone

D) estrogen and testosterone

E) estrogen and progesterone

Answer 1

D. Estrogen and testosteron

• Gonadotropin releasing hormone is released from hypothalamus and it stimulates release of LH (Lutinizing hormone) and FSH (Follicle stimulating hormone) from anterior pituitary.  
• In women LH act on ovaries and stimulate synthesis and release of estrogen, which stimulate development of female secondary se+ual characteristics.
• In males LH stimulate synthesis and release of testosteron, which stimulate development of secondary se+ual characteristics in males.