all-or-none law
| Noun | 1. |  all-or-none law - (neurophysiology) a nerve impulse resulting from a weak stimulus is just as strong as a nerve impulse resulting from a strong stimulus |
| 单词 | all-or-none law | |||
| 释义 | all-or-none law
all-or-none lawall-or-none phenomenonCardiologyThe property of cardiac muscle in which stimulation from a single myocyte travels to the atrium and ventricle before contracting, resulting in a coherent and co-ordinated pump activity. Physiology A rule applied to the activation of individual muscle or nerve cells, where the response to stimuli (depolarisation) only occurs above a certain threshold, usually –55 mV, after which a complete action potential occurs that is maximum in intensity—i.e., the strength of the nerve impulse is not dependent on, or a function of, the strength of the stimulus. Psychology A “soft” rule in behavioural studies, which refers to the observation that a behavioural stimulus will produce either a complete response or none at all. all-or-none lawThe property in muscle and nerve fibres of either responding wholly to a stimulus or not at all. The strength of the stimulus must exceed a particular threshold or there will be no response, but when the response occurs it is total. The law applies to individual fibres and a graded response is obtained by a variation in the number of fibres activated.all-or-none lawa law stating that certain tissues respond in a similar way to stimuli no matter how strong the stimuli are, i.e. they either react by giving a response (all), or do not react and give no response (none). Nerve fibres normally act in this way.all-or-none law
Words related to all-or-none law
|
|||
| 随便看 |
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。