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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 female, the testicles in a male.
During puberty, an increase in the levels of male sex hormones leads to the development of some secondary sex characteristics, such as increased muscle mass, deepening of the voice, development of pubic hair, and a growth spurt. The penis and scrotum may grow larger. People with 5-alpha reductase deficiency do not develop much facial or body hair.
Over time, they may diminish, but will not disappear completely. Striae are caused by tearing of the dermis during periods of rapid growth of the body, such as during puberty or pregnancy, in which they usually form during the last trimester. Usually on the belly, these striae also commonly occur on the breasts, thighs, hips, lower back, and ...
The adolescent growth spurt is a rapid increase in the individual's height and weight during puberty resulting from the simultaneous release of growth hormones, thyroid hormones, and androgens. [ 37 ] : 55–56 Males experience their growth spurt about two years later, on average, than females.
Growth then proceeds at a slow rate until a period of rapid growth occurs shortly before puberty (between about 9 and 15 years of age). [86] Growth is not uniform in rate and timing across all parts of the body. At birth, head size is already relatively near that of an adult, but the lower parts of the body are much smaller than adult size.
Apr. 13—When he didn't make the varsity team at Kentwood (Washington) High School in his junior year, Michael Ajayi sat in his room, tears flowing, wondering if he had a future in basketball. It ...
Although physical growth is a highly regular process, all children differ tremendously in the timing of their growth spurts. [69] Studies are being done to analyze how the differences in these timings affect and are related to other variables of developmental psychology such as information processing speed.
In 1996, a 70-pound, 3 foot tall baby named Zach Strenkert appeared on the "Jerry Springer" show. Strenkert’s parents, Laurie and Chris, were desperate for answers to why their 17-month-old son ...