| A | B |
|---|
| homeostasis | maintenance of a constant internal state |
| tissue | group of similar cells that do the same job |
| organ | collection of tissues tha carry out a certain function |
| skeletal system | supports and protects the body, allows movement |
| cartilage | flexible tissue |
| compact bone | rigid, dense bone with no visible open spaces |
| spongy bone | bone that provides most of the strength and support in the bone |
| marrow | soft tissue inside bone |
| joint | place where bones meet |
| ligaments | hold joints together |
| muscular system | allows movement and flexibility |
| tendons | connects muscle to bone |
| flexor | muscle that bends |
| extensor | muscle that straightens |
| strain | overstretched or torn muscle or tendon |
| sprain | stetched or torn ligament |
| integumentary system | forms a protective covering on the outside of the body |
| epidermis | surface layer of cells |
| dermis | layer of skin below the epidermis |
| melanin | chemical that gives hair and skin color |
| hair follicle | tiny sac where hair forms |
