Sexual maturation during adolescence diagrams

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 body has been developed.
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The 5 Stages of Puberty in Boys

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The 5 Stages of Puberty in Boys

The teenage years are also called adolescence. This is a time for growth spurts and puberty changes sexual maturation. A teen may grow several inches in several months, followed by a time of very slow growth. Then they may have another growth spurt. Puberty changes may happen slowly.
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Puberty in Boys

Adolescence is a transitional period of physical and behavioral development between childhood and adulthood. Puberty is a distinct period of sexual maturation that occurs during adolescence. Since the advent of magnetic resonance imaging MRI , human studies have largely examined neurodevelopment in the context of age. A breadth of animal findings suggest that sex hormones continue to influence the brain beyond the prenatal period, with both organizational and activational effects occurring during puberty. Given the animal evidence, human MRI research has also set out to determine how puberty may influence otherwise known patterns of age-related neurodevelopment.
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Girls and boys experience different changes in their bodies during puberty. The changes in your body during puberty are caused by hormones which are chemicals produced in your body. These hormones are like chemical messages that cause the testicles or the ovaries to release other hormones. There is no set age when this will happen. Puberty may start when you are eight or it may not start until much later.
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