Presynaptic Facilitation Occurs When

question 139

Multiple Choice

Presynaptic facilitation occurs when

• A) extracellular concentration of sodium increases.
• B) extracellular concentration of potassium increases.
• C) calcium channels in the presynaptic membrane are inhibited.
• D) calcium channels in the presynaptic membrane remain open longer.
• E) temporal summation occurs.

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