* is responsible for the fast growth you experience during your teen years.
* the endocrine system is made up of glands located throughout the body.
* the endocrine glands work by responding to signals from the brain or from the pituitary gland.
the Male reproductive system
* urethra: tube that carries urine and sperm to the outside of the body.
* Penis: the external sexual organ.
* testes : two small glands that produce sperm and hormones.
* scrotum: muscular sac that contains the testes.
female reproductive system
* ovaries: contain the ova, or eggs and produce hormones.
* fallopian tubes: carry eggs from the ovaries to the uterus.
* uterus: shelters and nourishes the fetus.
* endometrium: the lining of the uterus.
*Cervix: open of the uterus.
*Vigina: muscular passageway from the uterus to the outside of the body.
* during puberty, egg cells mature and are released by the ovaries in a process called ovulation.
*ovulation-the release of one mature egg each month.
*menstruation-when the lining material, the unfertilized egg, and some blood flow out of the body.
*menstrual cycle-hormonal changes that occur in females from the beginning of one menstruation to the next.
*fertilization: the union of a single sperm and an ovum.
*zygote: a fertilized ovum
*blastocyst: a ball of cells with a cavity in the center.
*amniotic sac: a fluid-filled sac that surrounds the embryo.
*each year, one-quarter of all new cases of STD's appear among 15 to 19 year olds. STD's can be bacterial (cure) or a virus (no cure).
*most STD's are spread through sexual contact.
*you cannot tell if someone has an STD by their appearance.
HIV/AIDS and abstinence:
*avoid being alone on a date.
*HIV-human immunodeficiency virus
*AIDS-a deadly disease that interferes with the body's natural ability to fight infection.