| A | B |
|---|
| flexion | bend |
| extension | straighten |
| rotation | move around an axis |
| abduction | move away from the midline |
| adduction | to move towards the midline |
| insertion | muscle attachement point which moves |
| origin | muscle attachment point which does not move |
| sarcolemma | muscle cell membrane |
| sarcoplasm | muscle cell cytoplasm |
| striated | striped appearance |
| contractablity | ability to shorten |
| excitablity | ability to carry nerve impulse |
| extensibility | ability to stretch |
| elasticity | ability to return to original length |
| tendon | tissue that connects muscle to bone |
| belly | the main part of the muscle |
| prime mover | muscle that is creating the movement |
| antagonist | muscle that works opposite of the prime mover |
| antagonist pair | muscles that work in opposition |
| dorsiflexion | move foot towards knee |
| plantar flexion | point toes |
| motor unit | nerve and muscle fibers |
| acetylcholine | chemical that carries impulse from the nerve to the muscle |
