C2.2 Neural signalling Quiz
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5 questions, one answer each
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1. How many sodium ions are pumped out per cycle of the sodium–potassium pump?
- A. 1
- B. 2
- C. 3
- D. 4
2. Which fibre of a neuron is single and long?
- A. Dendrite
- B. Axon
- C. Synapse
- D. Cell body
3. Conduction speed and axon diameter show:
- A. A negative correlation
- B. A positive correlation
- C. No correlation
- D. A correlation of exactly −1
4. What enters the presynaptic neuron and triggers exocytosis?
- A. Sodium ions
- B. Potassium ions
- C. Calcium ions
- D. Acetylcholine
5. An excitatory postsynaptic potential is:
- A. A hyperpolarisation
- B. A depolarisation
- C. The resting potential
- D. Release of calcium