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Muscular System
Human Anatomy and Physiology
| Question | Answer |
|---|---|
| Tendon | Fibrous tissue that connects muscle to bone |
| Myosin | Protein that causes muscle contractions and relaxation (thick filament) |
| Actin | Protein that causes muscle contraction and relaxation (thin filament) |
| Sarcomeres | Structural and functional unit of a myofibril |
| Neurotransmitters | Chemical that stimulates muscle fiber to contract |
| Threshold Stimulus | Stimulus level that must be exceeded to elicit a nerve impulse |
| Refractory Period | Time period following stimulations; no response to stimuli |
| Myofibrils | Contractile fibers within muscle cells |
| Fascia | Fibrous connective tissue that encloses a muscle |
| Twitch | Brief muscle contraction followed by relaxation |
| Motor Neuron | Transmit impulses from the CNS to an effector |
| Synaptic Cleft | A narrow space between pre and post neurons |
| Origin | end of muscle attached to a relatively immovable part |
| Insertion | End of muscle attached to a movable part |