Synapses (OCR A-Level Biology A): Flashcards
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Synapse
Synapse
Junction between neurones for nerve impulse transmission
Nature of synaptic transmission
Nature of synaptic transmission
Chemical (not electrical)
Neurotransmitter
Neurotransmitter
Chemical messenger that transmits impulses across synapse
Common neurotransmitter in cholinergic synapses
Common neurotransmitter in cholinergic synapses
Acetylcholine
Cholinesterase function
Cholinesterase function
Breaks down acetylcholine to prevent continuous stimulation
Excitatory synapse effect
Excitatory synapse effect
Depolarisation (opens Na+ channels, more likely to fire)
Inhibitory synapse effect
Inhibitory synapse effect
Hyperpolarisation (opens Cl- channels, less likely to fire)
Temporal summation
Temporal summation
Single synapse fires repeatedly in quick succession
Spatial summation
Spatial summation
Multiple synapses fire simultaneously
Why one-way transmission at synapses
Why one-way transmission at synapses
Vesicles presynaptic only; receptors postsynaptic only