| A | B |
|---|
| tissue | groups of similar cells working together |
| organ | groups of similar tissues working together |
| cell | smallest living unit |
| system | groups of similar organs working together |
| stimulus | change or signal that can make organism react |
| response | action or change in behavior resulting from stimulus |
| gland | organ that produce and release chemicals into blood |
| hormone | chemical of endocrine system |
| homeostasis | retaining constant internal conditions |
| skeletal | system of support and protection |
| integumentary | system of defense and regulating body temperature |
| muscular | system that produces movement |
| circulatory | system delivery of O2, nutrients, and wastes |
| respiratory | system exchanging O2 and CO2 |
| digestive | system that breaks down food |
| excretory | system removing wastes |
| nervous | system controlling responses of body |
| endocrine | system controlling growth and development |
| reproductive | system producing gametes |
| immune | system fighting invaders |
