Muscle contraction begins when an action potential at the neuromuscular junction opens Ca2+ channels, releasing acetylcholine into the synaptic cleft. Acetylcholine bindings open Na+ channels on the sarcolemma, causing depolarization; acetylcholinesterase then breaks down acetylcholine to stop contraction.
La contracción muscular se inicia cuando un potencial de acción en la unión neuromuscular abre canales de Ca2+, liberando acetilcolina en la hendidura sináptica. La acetilcolina se une a receptores en el sarcolema, abriendo canales de Na+ y causando despolarización; la acetilcolinesterasa luego descompone la acetilcolina para detener la contracción.
| Front | Describe the events that occur at a neuromuscular junction in order to cause (& stop) a muscle contraction. |
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| Back | Neuromuscular junction:
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