Final answer:
Puberty is when humans become sexually mature, usually starting around age 12 for boys. Hormones like testosterone play a key role in driving the physical changes of puberty, including growth spurts and reproductive organ development.
Explanation:
Puberty: What Happens and When
Puberty is the period during which humans become sexually mature. It typically begins around age 12 for boys in the United States. The physical changes of puberty, including growth spurts and development of reproductive organs, are mainly triggered by hormones like testosterone.
- Luteinizing hormone (LH): This hormone stimulates the testes to produce testosterone during puberty.
- Testosterone: Promotes protein synthesis and growth, leading to physical changes in boys during puberty.
- Adolescent growth spurt: A rapid increase in height and weight that typically occurs during puberty.
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