Neurones and nerve impulses Quiz
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5 questions, one answer each
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1. Which neurone has its cell body in the CNS and a long axon to an effector?
- A. Sensory neurone
- B. Motor neurone
- C. Relay neurone
- D. Schwann cell
2. What is the approximate resting potential of an axon?
- A. +40 mV
- B. -55 mV
- C. -70 mV
- D. 0 mV
3. Which event directly causes depolarisation?
- A. Na⁺ diffuses in through voltage-gated channels
- B. K⁺ diffuses out
- C. The pump moves 3 Na⁺ out
- D. K⁺ channels open
4. What does the refractory period ensure?
- A. Impulses travel faster
- B. The membrane stays depolarised
- C. Na⁺ channels stay open
- D. Impulses travel in one direction only
5. Why is saltatory conduction faster than conduction in an unmyelinated axon?
- A. Myelin speeds up ion diffusion
- B. The impulse jumps between nodes of Ranvier
- C. More Na⁺ channels open along the whole axon
- D. Schwann cells generate action potentials