| A | B |
|---|
| aerobic | with oxygen |
| acetylcholine (ACh) | neurotransmitter between neuron and voluntary muscle |
| action potentials | electrical signals the produce excitability |
| adenosine triphosphate (ATP) | energy molecule needed for muscle contraction and relaxation |
| agonist | primary mover |
| anaerobic | without oxygen |
| antagonist | cause movement in the opposite direction |
| cardiac | involuntary muscle |
| contraction | shortening of a muscle |
| elasticity | ability of a muscle to return to original length |
| excitability | muscle response to certain stimuli |
| extensibility | ability of a muscle to be stretched |
| hernia | protrusion of an organ through a weak muscle |
| hypertrophy | caused by over-exercising |
| isometric contraction | muscle tenses but does not shorten |
| isotonic contraction | muscles contract and shorten |
| muscle fatigue | caused by accumulation of lactic acid |
| muscular dystrophy | group of diseases of muscles causing cell deterioration |
| myasthenia gravis | progressive muscular weakness and paralysis |
| origin | where muscle attached to bone |
| point of insertion | end of skeletal muscle attached to a moveable part |
| point of origin | end of skeletal muscle attached to a fixed structure |
| prime mover | moves muscle in one direction |
| sarcomere | functional unit of muscle contraction |
| sarcoplasm | muscle cell cytoplasm |
| skeletal | muscle attached to bone |
| sphincter | rings in muscles that control opening and closing |
| synergists | assist with movement |
| tetanus | lockjaw |
