How does exocytosis contribute to neurotransmitter release in nerve cells?

• A. By preventing neurotransmitter release until a signal is received.
• B. By degrading neurotransmitters before they reach the synapse.
• C. By storing neurotransmitters in the cytoplasm.
• D. By allowing neurotransmitter-containing vesicles to fuse with the plasma membrane and release their contents.

Answer: (D)