| A | B |
|---|
| locomotion | movement |
| motile | ability to move |
| sessile | remains still, hardly moves |
| axial skeleton | trunk; skull, ribs, pelvis, vertebrae |
| appendicular skeleton | limbs; arms, legs and adjoining bones |
| yellow marrow | stores fats |
| red marrow | produces red blood cells |
| osteoclasts | cells that break down bone |
| osteoblasts | cells that build bone |
| periosteum | skin that surrounds bone where blood vessels and nerves attach |
| haversian blood canals | opening in the bone to allow blood to nourish bone cells |
| joints | place where two bones come together |
| suture joint | immovable joint; skull, sternum, pelvis |
| ball-in-socket | rotation 360 degree - hips and shoulders |
| hinge joint | back and forth motion; knees and elbows |
| gliding joint | small bones move by each other, wrists |
| pivot joint | 180 degree rotation; neck |
| saddle joint | side-to-side and front-to-back motion - thumb |
| ossification | the hardening of cartilage to bone |
| cartilage | tough, fibrous, elastic tissue; cushions joints |
| tendons | connect bone to muscle |
| ligaments | connect bone to bone |
| sliding filament theory | theory of muscle movement; actin and myosin slide past each other |
| striations | stripes |
| antagonistic | work in pairs; do the opposite of each other |
| exoskeleton | skeleton on outside |
| endoskeleton | skeleton on inside |
| contractile proteins | basis for movement in all organisms |
| voluntary | under conscious control |
| involuntary | automatic; no control |
| cardiac muscle | heart; involuntary; striated; interlocking |
| smooth muscle | digestive tract and others, non-striated; straight; involuntary |
| skeletal muscle | striated, connected to bones; straight; voluntary |
