Males experience their growth spurt about two years later, on average, than females.
During their peak height velocity (the time of most rapid growth), adolescents grow at a growth rate nearly identical to that of a toddler—about 4 inches (10.3 cm) a year for males and 3.5 inches (9 cm) for females.
The accelerated growth in different body parts happens at different times, but for all adolescents it has a fairly regular sequence.
The first places to grow are the extremities—the head, hands and feet—followed by the arms and legs, then the torso and shoulders.
For example, researchers in neuroscience or bio-behavioral health might focus on pubertal changes in brain structure and its effects on cognition or social relations.
Adolescence is usually accompanied by an increased independence allowed by the parents or legal guardians, including less supervision as compared to preadolescence.The testes primarily release testosterone, and the ovaries predominantly dispense estrogen.The production of these hormones increases gradually until sexual maturation is met.Puberty occurs through a long process and begins with a surge in hormone production, which in turn causes a number of physical changes.It is the stage of life characterized by the appearance and development of secondary sex characteristics (for example, a deeper voice and larger adam's apple in boys, and development of breasts and more curved and prominent hips in girls) and a strong shift in hormonal balance towards an adult state.The end of adolescence and the beginning of adulthood varies by country and by function.