When a Depolarizing Graded Potential Makes the Axon Membrane Depolarize

question 35

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 occur.

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