| A | B |
| muscle tone | state of partial contraction |
| insertion | end of the muscle that MOVES when contracted |
| contracture | severe tightening of a flexor muscle |
| voluntary | contro over the action of a muscle |
| extensibility | ability of a muscle to be STRETCHED |
| exCITability | ability of a muscle to respond to stimulus |
| eLASTicity | ability of a muscle to return to its original shape |
| tendon | strong, tough connective tisue that attaches MUSCLES to BONES |
| ADDuction | move a part TOWARD the midline |
| flexion | bend lower arm up toward upper arm |
| extenSION | increasing the angle between two bones |
| rotation | head side to side |
| ABduction | moving arm OUT to side (away) |