| A | B |
|---|
| acetylcholine | neurotransmitter that causes muscle contraction |
| synergist | muscle that helps the prime mover |
| muscle tone | state of constant partial contraction |
| fixator | muscle of posture |
| tetanus | state of constant continuous contraction |
| sarcomere | the basic contractile unit of muscle |
| atrophy | degeneration of a muscle |
| myalgia | muscle pain |
| rigor mortis | stiffness of muscles after death |
| synapse | neuromuscular junction |
| contusion | another term for bruise |
| sarcolemma | cell membrane of a muscle fiber |
| isometric contraction | contraction with no change in muscle length |
| isotonic contraction | contraction with a constant force |
| origin | point of muscle attachment to immovable bone |
| insertion | point of attachment to movable bone |
| hernia | tear in abdominal muscle wall |
| myosin | protein making up thick filaments |
| actin | protein making up thin filaments |
| aponeurosis | flat sheet-like tendon |
| prime mover | main muscle or agonist |
| saracoplasmic reticulum | areas where Ca++ is stored |
| flaccid | "limp" untoned muscle |
| spastic | overly toned muscle |
| concentric contraction | contraction that shortens a muscle |
| eccentric contraction | contraction in which the muscle lengthens |
