Well, you need evry single one of them but the most important one id yhe endocrine system.
The endocrine system is responsible for triggering puberty in the body. During puberty, the endocrine system releases hormones that stimulate physical changes such as growth spurts, development of secondary sexual characteristics, and reproductive maturity.
The most important change is the reproductive system becoming fertile. Also there are many emotional changes .
The endocrine system, specifically the pituitary gland and the hypothalamus, releases hormones that signal the start of puberty. These hormones stimulate the production of sex hormones, such as estrogen and testosterone, which are responsible for the physical changes associated with puberty.
There are many physical changes like the increase in height and weight. But more importantly the reproductive system becomes fertile.
changes in the reproductive system
during puberty
Hormones released by the endocrine system cause the changes associated with puberty.
Puberty is apparently triggered by a chemical from the hypothalamus gland, which stimulates the release of hormones by the pituitary gland, which in turn causes sex hormones to be generated in the ovaries (female) or testes (male). Puberty normally occurs between the ages of 10 to 17 for girls, and 12 to 18 for boys. Puberty is the post-adolescent onset of sexual physiology, as the body completes the development of the reproductive system. This includes hormonal changes, as well as associated behavioral attitudes and inclinations. Boys become more interested in girls, and girls in boys. This is the beginning of human adulthood. Changes in the body are not limited to sexual ones, but encompass extensive physical and mental alterations that define gender differences.
Thymus
During puberty, our reproductive system becomes fertile. Also the sex hormones cause the romantic feelings as we have to procreate .
the answer to this question is puberty
During puberty, males experience physical changes such as growth of facial hair, deepening of voice, increased muscle mass, and development of the reproductive system including testicular growth and sperm production. Hormones like testosterone play a significant role in these changes. Emotional and psychological changes may also occur during this period.