Zusammenfassung der Ressource
Flussdiagrammknoten
- An impulse arrives at the presynaptic knob
- Post-synaptic membrane depolarised causing action potential
- Voltage-dependant calcium channels open, causing influx of Ca+
ions
- Synaptic vesicles contain acetylcholine bind to presynaptic membrane and releases neurotransmitter by exocytosis into synaptic cleft
- Neurotransmitter diffuses to receptor on a protein on post-synaptic
membrane
- Co-operative binding on receptor: 2 receptor sites
- Threshold reached (-55mV)
- Channel opens and Na+ ions diffuse in
- Acetylcholine hydrolysed or destroyed by enzyme