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词汇 Neuromuscular transmission
分类 英语词汇 英语翻译词典
释义

Neuromuscular transmission

中文百科

神经肌肉接点 Neuromuscular junction

（重定向自Neuromuscular transmission）

神经肌肉接点又称神经肌肉接触面。神经纤维与肌肉细胞之间的化学联络点。与神经元之间的突触同功。神经纤维分为许多末梢分支，每个分支嵌入肌细胞膜上称为终板的凹陷中。终板内容纳数以千计的受体（长形的蛋白质分子，形成穿过膜的信道）。

英语百科

Neuromuscular junction 神经肌肉接点

（重定向自Neuromuscular transmission）
At the Neuromuscular Junction, the nerve fiber is able to transmit a signal to the muscle fiber by releasing ACh(and other substances), causing muscle contraction.
Muscles will contract or relax when they receive signals from the nervous system. The neuromuscular junction is the site of the signal exchange. The steps of this process in vertebrates occur as follows:(1) The action potential reaches the axon terminal. (2) Voltage-dependent calcium gates open, allowing calcium to enter the axon terminal. (3) Neurotransmitter vesicles fuse with the presynaptic membrane and acetylcholine (ACh) is released into the synaptic cleft via exocytosis. (4) ACh binds to postsynaptic receptors on the sarcolemma. (5) This binding causes ion channels to open and allows sodium ions to flow across the membrane into the muscle cell. (6) The flow of sodium ions across the membrane into the muscle cell generates an action potential which travels to the myofibril and results in muscle contraction.Labels:A: Motor Neuron AxonB: Axon TerminalC. Synaptic CleftD. Muscle CellE. Part of a Myofibril

A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.
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