Synaptic transmission Quiz
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5 questions, one answer each
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1. Which sequence of events at a cholinergic synapse is correct?
- A. Acetylcholine release, calcium entry, receptor binding, sodium entry
- B. Calcium entry, acetylcholine release, receptor binding, sodium entry
- C. Calcium entry, receptor binding, acetylcholine release, sodium entry
- D. Sodium entry, calcium entry, acetylcholine release, receptor binding
2. What is the role of acetylcholinesterase?
- A. It makes acetylcholine in the postsynaptic neurone
- B. It opens sodium ion channels
- C. It hydrolyses acetylcholine in the cleft
- D. It causes vesicles to fuse with the membrane
3. A neurone releases transmitter three times in quick succession and an action potential starts in the postsynaptic neurone. This is:
- A. Spatial summation
- B. Temporal summation
- C. Hyperpolarisation
- D. Facilitated diffusion
4. Which feature of a neuromuscular junction is not found at a typical synapse between neurones?
- A. Vesicles containing acetylcholine
- B. Acetylcholinesterase in the cleft
- C. A folded postsynaptic membrane that is always excitatory
- D. Voltage-gated calcium ion channels
5. A drug blocks the receptors for acetylcholine on a postsynaptic membrane but does not open them. Which prediction is correct?
- A. Acetylcholine would build up and keep the sodium channels open
- B. The postsynaptic membrane would not depolarise
- C. More vesicles would fuse with the presynaptic membrane
- D. The postsynaptic membrane would hyperpolarise through chloride entry