When a neuron receives a signal from another neuron, the voltage-gated sodium ion channels of the receiving neuron: A) lead to hyperpolarization when opened. B) are found in the dendrites. C) allow Na⁺ ions to exit the neuron. D) allow Na⁺ ions to enter the neuron.

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When a neuron receives a signal, the voltage-gated sodium ion channels open, allowing sodium ions (Na+) to enter the neuron. This influx of Na+ ions causes depolarization of the neuron, which is a crucial step in the propagation of the neural signal.

When a Neuron Receives a Signal from Another Neuron, the Voltage-Gated