Development of the human body used to approximately judge a child's age based on physical development. Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult
Catholic theology of the body communicate with him. The human body is the lower element of the human person. Through the body, man experiences his temporal existence. But Gregory also admired human beauty and the bodily abilities to dream, sleep and memorize. The body can be both a friend and enemy of a person, according to Gregory. The final goal is a unity of the soul with God, which is possible with Grace and the assistance of the Holy Spirit according to Gregory. Gregory of Nyssa (335-394) was a bishop who wrote, among others, about the creation of the human body. Unlike Irenaeus, Gregory states,