puberty
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What is puberty?
Puberty is the stage of life when a child's body changes into that of an adult capable of reproduction. Timing varies due to genetics and environmental factors, typically occurring between ages 11 and 16.
During puberty, both sexes experience rapid increases in body size and changes in body shape and composition, along with the development of reproductive organs and other characteristics indicating sexual maturity. Hormones such as testosterone and estrogen drive many of these changes. The sequence of events is generally consistent, though the timing can differ significantly among individuals.
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At what age does puberty usually begin for boys and girls?
Puberty, the stage of life when a child transitions into a procreative adult, typically occurs between the ages of 11 and 16, though the timing varies due to genetic, environmental, and other factors.
In girls, the first sign of puberty is usually the enlargement of the breasts, with the nipples starting to grow, followed by the development of breast tissue. Pubic hair appears, and a period of rapid growth begins. The ovaries start producing estrogen, leading to fat deposits on the hips and thighs.
In boys, the first sign is generally the accelerated growth of the testes and scrotum, accompanied by reddening and wrinkling of the scrotal skin. Pubic hair may appear around the same time or shortly after. Approximately a year later, a rapid increase in height occurs, similar to the growth rate experienced around age two. The penis also grows, along with the seminal vesicles, prostate, and bulbo-urethral glands.
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What causes the body to start puberty?
Puberty starts when the brain signals the pituitary gland to release gonadotropins. This happens when the hypothalamus becomes less sensitive to sex hormones, leading to the release of gonadotropin-releasing hormone (GnRH). In both sexes, puberty begins with nocturnal pulses of GnRH, stimulating the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
In boys, LH stimulates the testes to produce testosterone, leading to the development of male secondary sex characteristics. In girls, FSH causes growth in the ovaries, and estrogens are secreted, which leads to the development of female secondary sex characteristics.
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How do hormones affect the changes during puberty?
During puberty, hormones trigger a range of physical and emotional changes. The process begins when the hypothalamus releases gonadotropin-releasing hormone (GnRH), stimulating the pituitary gland to produce follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
In males, LH stimulates the testes to produce testosterone, leading to the development of male secondary sex characteristics such as increased muscle mass, hair growth, and enlargement of reproductive organs. In females, FSH and LH stimulate the ovaries to produce estrogens, which promote the development of female secondary sex characteristics like breast growth, widening of the hips, and the start of menstrual cycles. These hormonal changes also contribute to the adolescent growth spurt in both sexes.
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What are some physical changes that happen to the body during puberty?
During puberty, the body undergoes significant physical changes driven by hormones. Both sexes experience a rapid increase in body size, along with changes in body shape and composition, and the development of reproductive organs.
In boys, muscle size and strength increase, and physiological changes occur that allow them to do more strenuous physical work. The testes and scrotum grow, and the scrotal skin becomes red and wrinkled. Facial, pubic, and armpit hair appears, the voice deepens, and the larynx enlarges.
In girls, the breasts, uterus, and vagina develop, and the external genitalia enlarge. Body fat is deposited around the hips and thighs, and armpit and pubic hair grows more abundantly. Menarche, the first menstrual period, occurs.
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How does puberty affect emotional and mental health as well as the body?
Puberty, typically occurring between ages 11 and 16, involves significant physical, emotional, and mental changes.
Physical Changes
During puberty, both sexes experience rapid increases in body size and development of reproductive organs. Girls may notice breast development, fat deposits on the hips and thighs, and the start of menstruation. Boys experience growth of the testes and scrotum, along with muscle development and voice changes.
Mental and Emotional Health
Adolescents may face considerable emotional and mental turmoil, such as feelings of inadequacy and internal disorganization. Psychological disturbances during this time can range from minor emotional upsets to more severe conditions like schizophrenia. The use of puberty blockers can also lead to mood changes and potential emotional and social challenges, especially if physical changes are delayed for gender-related reasons.
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puberty, in human physiology, the stage or period of life when a child transforms into an adult normally capable of procreation.
A brief treatment of puberty follows. (See also adolescence.)
Because of genetic, environmental, and other factors, the timing of puberty varies from person to person and from country to country, but it usually occurs between ages 11 and 16. Among moderately well-off British or North American children, for example, puberty on average peaks at about age 12 for girls and age 14 for boys. However, increasing numbers of girls in those countries have started puberty by age 7 or 8. In 2010 a study of girls in three U.S. metropolitan regions revealed that some 10.4 percent of white girls, 14.9 percent of Hispanic girls, and 23.4 percent of black girls had begun puberty by age 7. Generally, puberty occurs earlier in black girls, the age range in the United States being between ages 9 and 14, compared with an age range between 10 and 14 for white girls in that country.
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The rapidity with which a child passes through the several stages of puberty also varies. In girls the interval from the first indication of puberty to complete maturity may vary from 18 months to 6 years. In boys a similar variation occurs; the male genitalia may take between 2 and 5 years to attain full development.
In puberty both girls and boys experience a swift increase in body size, a change in shape and composition of the body, and a rapid development of the reproductive organs and other characteristics marking sexual maturity. In a girl the first observable change is usually noted in the breasts; the nipples start to enlarge, and a few months later the breast tissue begins to grow. A few pubic hairs develop, and she enters into a period of relatively rapid growth. The ovaries begin producing estrogen, causing fat deposits to develop on the hips and thighs, and the slim, angular girl moves steadily toward a more rounded female contour. The larynx undergoes minor structural changes so that her voice alters and becomes less childlike (but the changes are not nearly so radical as those in a boy). Meanwhile, her adrenal glands are manufacturing male sex hormones, which play a key role in the development of pubic and underarm hair and contribute to the physical growth. The first menstrual period is generally the final event, usually occurring about two or more years after the entire puberty process is under way. During the following two years, the girl’s menses are apt to be irregular; her normal cyclic hormonal pattern has not yet been established, and ovulation is infrequent. Eventually, however, her menstruation and ovulation cycles become more regular.
In boys the first sign of puberty is usually an accelerated growth of the testes and scrotum, with reddening and wrinkling of the scrotal skin. The first pubic hair may begin at the same time or a little later. About a year later the boy’s height is apt to be increasing again at the rapid rate that he last experienced at about age two. At this time the penis also grows, as do the seminal vesicles, the prostate, and the bulbo-urethral glands, all of which contribute their secretions to the seminal fluid. The time of the first ejaculation of seminal fluid varies but usually occurs about a year after the beginning of accelerated penis growth. Unlike the girl’s initial irregularity in menses and ovulation, the boy’s fertility may be almost constant after initial ejaculation. In a final stage, averaging about two years after the beginning of pubic hair growth, hair begins to appear on the armpits and face, and there may soon appear hair on the chest and other parts of the body (though much of this general hair growth may occur after puberty). The voice changes in pitch because of the enlargement of the larynx and lengthening of the vocal cords, initiated by action of the male hormone testosterone.
Numerous factors may retard maturation or prevent normal growth, including hormonal disorders, metabolic defects, hereditary conditions, and inadequate nutrition.
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