What are the events in synaptic transmission?
- The presynaptic action potential reaches the synaptic knob. 2) The terminal is depolarised. 3) Voltage gated calcium channels in the presynaptic knob open. 4) Calcium enters through the calcium channels. 5) This calcium ions cause the fusion of synaptic vesicles to the presynaptic membrane. 6) There is neurotransmitter release e.g. acetylcholine by exocytosis. 7) Acetylcholine diffuses across the synaptic cleft and bind to receptors on the postsynaptic neuron. 8) This causes sodium ion channels in the postsynaptic neurone to open. 9) Sodium ions diffuse in. 10) Excitatory postsynaptic potentials are created. If these generator potentials are sufficient, then the postsynaptic terminal reaches threshold potential and there is propagation.
TD
Related Biology A Level answers
All answers ▸Describe the similarities and differences between ultrafiltration in the kidneys and the formation of tissue fluid.
Describe the structural differences between arteries, veins and capillaries and link to their function
How do organisms adapt?
Describe the differences between the primary and secondary immune responses in terms of B cells and antibody production. Include in your answer a definition of an antibody.