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photo a gate can keep you out or let you into a field in the same way a microscopic logic gate is a barrier in an electronic circuit that can let electricity through or stop it flowing altogether put lots of logic gates together and you make a machine that s capable of basic mathematical reasoning
In neurons, stimuli can alter this potential difference by opening sodium channels in the membrane. For example, neurotransmitters interact specifically with sodium channels (or gates). So sodium ions flow into the cell, reducing the voltage across the membrane. Once the potential difference reaches a threshold voltage, the reduced voltage causes hundreds of sodium gates in that region of the membrane to open briefly. Sodium ions flood into the cell, completely depolarizing the membrane (b).