| 释义 |
motor unit
noun[ C ]
anatomy specializeduk /ˈməʊ.tə ˌjuː.nɪt/ us /ˈmoʊ.t̬ɚ ˌjuː.nɪt/
a motor neuron(= a nerve cell that sends messages to muscles) and the muscle fibres it supplies:
A muscle is formed by many motor units, each one bringing its own specific contribution.
Muscle strength decreases with age, partly due to a reduction in the number of motor units, and in part to muscle atrophy.
French- and Spanish-speaking children use different visual and motor units during spelling acquisition.
With progressive muscle contraction, increasing numbers of motor units are recruited, and each motor unit fires at a more rapid rate.
An excitatory impulse causes contraction of all the muscle fibres in that motor unit.
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