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nmdcat.online July 7, 2026

A decrease in the calcium concentration of the extracellular fluid surrounding a sensory synaptic terminal typically results in

A. Massive neurotransmitter exocytosis
B. Decreased neurotransmitter release
✓
C. Spontaneous action potential generation
D. Hyperpolarization of the postsynaptic membrane

📝 Explanation

Calcium influx through voltage-gated calcium channels is absolutely essential for the exocytosis of neurotransmitter vesicles. Low extracellular calcium directly impairs this release mechanism.

📖 Additional Information

  • Massive neurotransmitter exocytosis
  • Decreased neurotransmitter release
  • Spontaneous action potential generation
  • Hyperpolarization of the postsynaptic membrane

Calcium influx through voltage-gated calcium channels is absolutely essential for the exocytosis of neurotransmitter vesicles. Low extracellular calcium directly impairs this release mechanism.

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