A Neuron Fires When Na⁺ Ions

question 11

Multiple Choice

A neuron fires when Na⁺ ions

• A) move down their concentration gradient by the process of facilitated diffusion.
• B) are actively pumped down their concentration gradient.
• C) move against their concentration gradient spontaneously.
• D) are actively pumped against their concentration gradient.
• E) are released from an internal store.

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