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5.2 Skeletal Muscle
Skeletal Muscle Actions
| Question | Answer |
|---|---|
| acetylcholine | a neurotransmitter chemical that stimulates muscle |
| action potential | the electric charge produced in nerve or muscle fiber by stimulation |
| all-or-none law | the rule stating that the fibers in a given motor unit always develop maximum tension when stimulated |
| axon | a long, thin fiber connected to the motor neuron cell body |
| axon terminal | offshoots of the axon that branch out to connect with individual muscle fibers |
| cross bridges | connections between the heads of myosin filaments and receptor sites on the actin filaments |
| fast-twitch | type of muscle that contracts quickly |
| motor neuron | a nerve that stimulates skeletal muscle tissue |
| motor unit | a single motor neuron and all of the muscle fibers that it stimulates |
| neuromuscular junction | the link between an axon terminal and a muscle fiber |
| parallel | a type of muscle fiber arrangement in which fibers run largely parallel to each other along the length of the muscle |
| pennate | a type of muscle fiber arrangement in which each fiber attaches obliquely to a central tendon |
| sarcomeres | units composed of actin and myosin that contract inside the muscle fiber |
| slow-twitch | type of muscle that contracts slowly and is fatigue resistant |
| synaptic cleft | the tiny gap that separates the axon terminal and muscle fiber |
| tetanus | a sustained, maximal level of muscle tension that occurs with high-frequency stimulation |
Created by:
lgratz
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