| A | B |
|---|
| adolescence | stage of human developement that begins around 12-14 and lasts to age 20 |
| adulthood | stage of human developement that begins around twenty to old age |
| amniotic sac | thin membrane that forms around an embryo, filled with fluid that cushions |
| centenarian | person100 years or more |
| childhood | stage of human developement from infancy to age 12 |
| embryo | fertilized egg during early growth; human unborn the first two months of pregnancy |
| fetus | developing embryon in humans; after the first 2 months of f pregnancy |
| infancy | stage of human develpment from 4 weeks to one year |
| menopause | period of years in older females when the menstrual cycle becomes irregular and eventually ceases |
| menstrual cycle | the hormonally regulated cycle of egg pproduction and menstruation in females |
| menstruation | monthly shedding of the lining of the uterus that takes place in females when fertilization of an egg has not occurred |
| ovary | female organ that produces eggs |
| ovulation | monthly release of egg from ovary |
| pregnancy | period of time between fertilization and birth (9months in humans) |
| semen | mixture of sperm and fluid that of nourishment and mobility |
| sperm | male gamete produced in testes |
| testis | male reproductive organ that produces sperm and testosterone |
| uterus | pear-shaped, hollow, muscular organ in which fertilized egg developes (womb) |
| vagina | passageway leading from the outside of the female to the uterus |
