Answer:
At a certain age, the hypothalamus which is an essential part of the brain that releases a gonadotrophin-releasing hormone which stimulates the pituitary to release two important hormones luteinizing hormone and follicle-stimulating hormone.
These hormones transported through the blood to the testicle and ovary in boys and girls respectively. In boys, LH and FSH reach the testicle and start production of another hormone testosterone which helps in the development procedure and changes in the body.
In girls, the LH and FSH stimulate the ovary and start producing estrogen which helps in puberty which is changes in the body and prepares the body for pregnancy.
Thus, these hormones are responsible for the onset of puberty.
