| TERM | DEFINITION |
| Afterbirth | placenta and fetal membrane expelled from the uterus after the birth of a baby |
| Amniotic sac | fluid-filled membrane or sac that surrounds the developing embryo while in the uterus; also "bag of water" |
| Anus | opening through which solid wastes are eliminated from the body |
| Birth | the process of being born; the process by which a baby moves from the uterus into the outside world |
| Bladder | the organ that stores urine |
| Ceasarian Section | the surgical removal of a baby by an incision through the abdominal and uterine walls |
| Cervix | lower part, or neck, of the uterus. It is an opening to the uterus |
| Clitoris | small, sensitive organ in front of the vagina |
| Conception | fertilization of an egg cell by a sperm cell |
| Egg cell | a female sex cell (female gamete or ovum) |
| Ejaculation | the discharge of semen from the penis |
| Embryo | the unborn child developing in the uterus between the second and eighth weeks of life |
| Endometrium | the lining of the uterus. This is where the blastocyst will implant itself |
| Epididymis | the tightly coiled tube at the back at each testis |
| Erection | the condition of the penis when it becomes firm, enlarged, and erect |
| Fallopian tube | a tube leading from the ovary to the uterus |
| Fertile | able to conceive a child |
| Fertilization | the union of a sperm and an egg |
| Fertilized egg | an egg after a sperm has united with it |
| Fetus | the unborn child developing in the uterus after the first eight weeks of life |
| Hormones | chemical substances produced by the endocrine glands; they act in other parts of the body and affect maturation, growth, and behavior |
| Hymen | a thin bit of tissue, or membrane, that may partially cover the opening of the vagina |
| Labia | two folds of skin surrounding the entrance of the vagina |
| Labor | the muscular contractions that expel a baby from the uterus during childbirth |
| Menstrual cycle | the periodic building up and sloughing off of the lining of the uterus approximately every twenty-eight days |
| Menstruation | the periodic discharge of blood and waste material from the uterus |
| Ovary | one of the two female sex glands; they produce egg cells and sex hormones |
| Ovulation | the discharge, or release, of an egg cell from the ovary |
| Penis | the male sex organ through which sperm cells leave the body; it also discharges urine |
| Placenta | network of blood vessels and other tissues by which the unborn child is attached to the wall of the uterus |
| Pregnant | the condition of a woman with an embryo or fetus in her uterus |
| Prostate gland | an organ that surrounds the upper end of the male urethra and produces part of the fluid that mixes with the sperm to form semen |
| Scrotum | the pouch of loose skin containing the testes |
| Semen | the mixture of sperm and fluids that appears at ejaculation |
| Seminal vesicles | small saclike organs opening into each vas deferens near the upper end of the urethra; they produce part of the fluid that mixes with the sperm to form semen; they produce fructose |
| Sexual intercourse | the entry of the penis into the vagina and the subsequent release of sperm; also coitus |
| Sperm | the male sex cell (male gamete or spermatozoon) |
| Testes | the two male sex glands; they produce sperm cells and sex hormones; also testicles |
| Tubule | one of the many coiled, threadlike tubes within the testes |
| Umbilical cord | the ropelike structure connecting the embryo or fetus to the placenta within the uterus |
| Urethra | the tube through which urine is expelled from the bladder in both males and females and through which sperm leaves the male body |
| Uterus | the hollow pear-shaped organ in which a baby develops before it is born; also womb |
| Vagina | the passage from the uterus to the outside of the body |
| Vas deferens | the tube extending from each epididymis to the urethra |
