When a Depolarizing Graded Potential Makes the Axon Membrane Depolarize

question 34

Multiple Choice

When a depolarizing graded potential makes the axon membrane depolarize to threshold,

• A) ligand-gated Ca⁺² channels close rapidly.
• B) voltage-gated Ca⁺² channels open rapidly.
• C) ligand-gated Na⁺ channels close rapidly.
• D) voltage-gated Na⁺ channels open rapidly.
• E) none of these choices.

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