Fatal, deadly, lethal, mortal apply to something that has caused or is capable of causing death. Fatal may refer to either the future or the past; in either case, it emphasizes inevitability and the inescapableâthe disastrous, whether death or dire misfortune: The accident was fatal. Such a mistake would be fatal. Deadly looks to the future, and suggests that which is likely to cause death (though not inevitably so): a deadly poison, disease. Like deadly, lethal looks to the future but, like many other words of Latin origin, suggests a more technical usage: a lethal dose; a gas that is lethal.
Making the world better, one answer at a time. Causes of extrasystole include alcohol, ischemia, hypoxia, and myocarditis. Extrasystole is defined as a premature beat in the heart that causes momentary arrhythmia. Causes of extrasystole include alcohol, ischemia, hypoxia, and myocarditis. Extrasystole is defined as a premature beat in the heart that causes momentary arrhythmia.
When an action potential reaches the axon terminal of a motor neuron, vesicles carrying neurotransmitters (mostly acetylcholine) are exocytosed and the contents are released into the neuromuscular junction. These neurotransmitters bind to receptors on the postsynaptic membrane and lead to its depolarization.In the absence of an action potential, acetylcholine vesicles spontaneously leak into the neuromuscular junction and cause very small depolarizations in the postsynaptic membrane.hen an action potential causes the release of many acetylcholine vesicles, acetylcholine diffuses across the neuromuscular junction and binds to ligand gated nicotinic receptors (non-selective cation channels) on the muscle fiber.