| A | B |
|---|
| fetus | young mammal after fertilizationof the egg but before birth |
| hormones | substance produced by glands in the body. |
| menopause | time in a woman's life where menstruation stops. |
| menstruation | the monthly shedding of blood from the uterus. |
| neurons | cells throughout the body that carry signals to and from the brain. |
| organ | body tissues that form a working unit |
| ovaries | the female organs that make egg cells and hormones |
| puberty | the time in life when the reproductive organs develop |
| system | a group of organs working together |
| tendons | tough bands of tissue that attach muscle to bones. |
| testes | male organs that make sperm cells and hormones |
| tissue | group of cells that do all the same job. |
| uterus | the female organ in which a fertilized egg develops into a baby |
