Neuronal Communication (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the approximate width of the synaptic cleft?
What is the approximate width of the synaptic cleft?
20 nm
What triggers voltage-gated calcium channels to open in the presynaptic membrane?
What triggers voltage-gated calcium channels to open in the presynaptic membrane?
Depolarisation of presynaptic membrane
What does calcium ion influx cause in the presynaptic knob?
What does calcium ion influx cause in the presynaptic knob?
Vesicles fuse with membrane
Which enzyme breaks down acetylcholine in cholinergic synapses?
Which enzyme breaks down acetylcholine in cholinergic synapses?
Cholinesterase
What effect do excitatory synapses have on the postsynaptic membrane?
What effect do excitatory synapses have on the postsynaptic membrane?
Cause depolarisation
Which neurotransmitter is commonly associated with inhibitory synapses?
Which neurotransmitter is commonly associated with inhibitory synapses?
GABA
What is temporal summation?
What is temporal summation?
One synapse firing repeatedly over time
What is spatial summation?
What is spatial summation?
Multiple synapses firing simultaneously
Why can nerve impulses only travel in one direction across a synapse?
Why can nerve impulses only travel in one direction across a synapse?
Vesicles only on presynaptic side
What structures are found in the presynaptic knob?
What structures are found in the presynaptic knob?
Vesicles and mitochondria