represent certain chemical substances called hormones some of these hormones bring about changes within the body during puberty they are also responsible for the changes which finally turn a boy into a man and a girl into a woman these glands are the pituitary gland the thyroid important in the development of the human body during puberty either patil and hairy gland and the sex glands the pituitary gland sets off the process of puberty by increasing this increasing of that hormone which controls the rate of growth of the body therefore puberty is introduced by a rapid spurt of grow growth however varies for each individual person for some the young body may start its growth by shooting up several inches in a few months for others the growth and with may come first and there is even another kind of person the body may take its own good time before it starts growing in any direction however the proportions of the body usually become balanced when the process of puberty is completed some time after the period of rapid growth is started the pituitary gland for the first time to greet another kind of hormone this new hormone influences the sex glands in both sexes in the ma in the female ovaries the sex glands now increase their own production of hormones with the result that the physical differences between boys and girls become more pronounced in the boy the larynx in the vocal chords change so that his voice acquires the deeper peculiar man's voice their shoulders become broader the thighs grow longer and the muscles become stronger hair begins to grow on the face under the arms and in the pubic area perspiration also increases the girls also change their hips broaden out the thighs and shoulders become rounded the pubic hair and underarm hair begin to grow and the breasts begin to develop sometimes one breast will mature more rapidly than the other this occurs quite often and is no cause for concern but these developments of puberty do not always happen at the same age it is perfectly normal that some boys and girls develop sooner others later therefore wonder you're among the earlier the late ones don't let it bother you also for some boys pubic hair may be the first sign of puberty in others the change of voice and for some girls the development of breasts may indicate the beginning of puberty while another is this may be the last development to occur in addition to these developments another change stored in a long tube that is folded to fit within this growth of millions of sperm cells are stored in those two remotes some of them may be discharged from time to time during sleep from this reservoir the sperm cells travel through the seminal ducts here fluids from various glands are added to form the semen the semen containing the sperm cells passes through the ureter up sometimes called  and out of the penis the semen in the last part of its journey travels the same route taken by the urine coming from the bladder unlike the male the sex glands of the female the ovaries i located well within the body at puberty the ovaries begin to discharge eggs these eggs called over are the female sex cells they continue to be discharged for the next thirty years or so many eggs grow in the ovaries but usually only one matures about every twenty eight days when an egg matures it breaks through the law of fallopian tubes of the female that fertilization usually takes place fertilization is the process whereby a single male sperm combines with a female egg to produce a new human life the fertilized egg then moves on and attaches itself to the walls of the uterus the baby is developing in the uterus of the mother food from the blood in the wall lining of the uterus feeds the growing baby until it is fully developed within the mother there is no direct connection between the blood of the mother and the blood of the baby the time during which this development occurs last nine months and is called pregnancy after this the baby is born does not occur the egg dissolves or disappears when this happens the blood in the wall lining of the uterus is not needed and is discharged from the body this is called menstruation and happens every time an away that is of about every twenty eight days so we have seen that during adolescence our bodies undergo some intricate and wonderful changes as a result of these changes boys and girls become men and women bigger wronger and capable of having children of their own