The neurotransmitter used at the neuromuscular junction:

Question

Answer

increases the permeability of the presynaptic membrane to Ca++ ions

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increases the permeability of the presynaptic membrane to Na+ ions

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causes ligand gated Ca++ channels in muscle fibres to increase permeability to Ca++ to hyperpolarise the postsynaptic membrane due to loss of Ca++

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depolarizes the presynaptic membrane by increasing the permeability of Na+

Answer

causes ligand gated Na+ channels in muscle fibres to increase permeability, resulting in postsynaptic membrane depolarization

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