Biology A-Level
Calcium-triggered exocytosis
What Calcium-triggered exocytosis means in Biology A-Level, as defined for OCR.
Definition of Calcium-triggered exocytosis
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Reference: OCR
An arriving action potential opens voltage-gated Ca²⁺ channels, and Ca²⁺ entry into the presynaptic knob triggers vesicle fusion and release of neurotransmitter into the cleft.
Topics that use Calcium-triggered exocytosis
- Neuronal communication (OCR A-Level)
Related terms
- All-or-nothing law and impulse frequency
- Excitatory and inhibitory postsynaptic effects
- generator potential
- Relay neurones
- Resting potential and the sodium–potassium pump
- saltatory conduction
- Saltatory conduction and refractory period
- Sensory neurones
Using Calcium-triggered exocytosis in the exam
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