Skeletal Muscle
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8 terms
Terms | Definitions |
|---|---|
 Motor Neurons | Stimulate skeletal muscle contraction from the central nervous system (CNS). |
| Motor Unit | One motor neuron and all the muscle fibers it stimulates. |
| Motor units vary... | in the number of muscle cells involved, depending on the strength or delicacy needed for the area in which they are found. |
| In the eye | very small, precise movements are required, One motor neuron may control only 10-15 muscle cells |
| In the hand | both precision and strength are needed, each motor nerve may synaps with 10-100 muscle cells |
| Single motor neuron | may innervate as few as 10 and as many as 2000 muscle fibers. |
| 150 | average muscle fibers per motor neuron |
| All or None Principle | Muscles contract all the way or not at all. Individual muscle fibers contract to their fullest extent. They do not partially contract. |
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