As an adolescent progresses through puberty, the hypothalamus (located in the brain) begins to release hormone signals to pituitary gland. The pituitary gland will then send chemical signals to the suprarenal glands (located above the kidneys, like hats). The zona reticularis (the inner layer of the suprarenal medulla) produces androgens which are sex hormones which act upon various organs and tissues in the body.
For example, in females, estrogen and progesterone will increase breast size while in males, testosterone will increase facial hair growth, increased muscle mass, deeper voice, etc.
You are around 13
hormones gave metabolism improved
hormones gave metabolism improved
adolescences
anal
Development
Puberty.
The expected life span is 4years as the child's immune system is destroyed when it is still in its developmental stage. Other people can live and the symptoms can be seen between childhood stage and adolescences.
hormones
In humans, the role of the testes is to produce sperm and androgens (male sex hormones; testosterone).
The Smooth endoplasmic Reticulum, catalyze reactions involved with: synthesis of steroid based hormones like sex hormones.
It is usually genetic, and hormones can play a role.