Puberty

Puberty is what happens to the bodies of girls and boys that changes them into women and men. When this happens, their bodies change in many ways.

Puberty is the period in human development during which physical growth and sexual maturation occur, marking the transition from childhood to adulthood. It is characterized by the development of secondary sexual characteristics, such as breast development in girls, growth of facial hair in boys, and changes in body composition in both sexes. Puberty is controlled by hormonal changes, primarily involving the hypothalamus, pituitary gland, and gonads.

Stages of puberty

Puberty is typically divided into five Tanner stages, which describe the development of secondary sexual characteristics and reproductive maturity. The stages are as follows:

Stage 1: Prepubertal – no signs of puberty
Stage 2: Beginning of puberty – breast buds in girls, testicular enlargement in boys
Stage 3: Continued development – growth of pubic hair, further breast development in girls, penis growth in boys
Stage 4: Advanced puberty – appearance of underarm hair, adult-like breast development in girls, further penis and testicle growth in boys
Stage 5: Adult – full sexual maturity

Timing of puberty

The onset of puberty varies between individuals and is influenced by genetic, environmental, and nutritional factors. In general, girls begin puberty between the ages of 8 and 13, while boys start between the ages of 9 and 14. Puberty typically lasts for 2-5 years.

Hormonal changes

The onset of puberty is triggered by the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus, which stimulates the anterior pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). These hormones then act on the gonads (ovaries in girls, testes in boys), leading to the production of sex hormones (estrogen and progesterone in girls, testosterone in boys) and the development of secondary sexual characteristics.

Puberty-related disorders

Several disorders can affect the normal progression of puberty, including:

Precocious puberty – the early onset of puberty, before the age of 8 in girls or 9 in boys
Delayed puberty – the absence of puberty by the age of 13 in girls or 14 in boys
Hypogonadism – the underdevelopment or malfunction of the gonads, resulting in low sex hormone production and impaired sexual development

Treatment for these disorders may include hormone replacement therapy or medications to regulate hormone production.

References

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