| A | B |
|---|
| tissue | a group of similar cells that work together to do a job |
| organ | a body part made up of one or more kinds of tissue |
| system | a group of organs working together to do a job |
| hormone | a substance made by organs called glands |
| skeleton | the bones that support, allow movement, and protect the organs of an animal with a backbone |
| calcium | a minderal found in teeth and bone |
| joint | a place where two bones meet |
| tendon | a tough band of tissue that attaches muscle to bone |
| puberty | the time in life when the reproductive organs develop |
| testes | the male organs where sperm cells are made |
| ovaries | the female organs where egg cells are stored |
| uterus | the female organ in which a fetus develops |
| fetus | an unborm baby that develops in a woman's uterus |
| menstruation | the monthly flow of blood from the uterus of a woman who is not having a baby |
