Neurones and the reflex arc Quiz
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5 questions, one answer each
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1. Which neurone has its cell body in the grey matter of the spinal cord and carries impulses to an effector?
- A. Motor neurone
- B. Sensory neurone
- C. Schwann cell
- D. Receptor cell
2. What forms the myelin sheath?
- A. The axon membrane only
- B. Dendrites
- C. Schwann cells wrapped around the axon
- D. The relay neurone
3. Which statement about the spinal cord is correct?
- A. White matter contains cell bodies and synapses
- B. Grey matter contains cell bodies and synapses
- C. Grey matter is mostly myelinated axons
- D. Sensory neurones leave through the ventral root
4. A reflex arc is broken at the relay neurone. What happens?
- A. The impulse still reaches the effector
- B. The effector does not respond, because the sensory neurone cannot pass the impulse to the motor neurone
- C. The impulse leaves the cord through the dorsal root
- D. A new Schwann cell grows immediately
5. Why are reflexes faster than voluntary actions?
- A. They involve few neurones and synapses and do not involve the brain first
- B. They use only motor neurones
- C. Impulses travel at a different speed in reflexes
- D. They involve more synapses