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Which row in the table shows the order of neurones an impulse travels through in a reflex arc? Order of neurones in a reflex arc First Second Third A sensory neurone motor neurone relay neurone B motor neurone relay neurone sensory neurone C motor neurone sensory neurone relay neurone D sensory neurone relay neurone motor neurone Your answer - OCR Gateway - GCSE Biology - Question 2 - 2021 - Paper 1
Question 2
Which row in the table shows the order of neurones an impulse travels through in a reflex arc? Order of neurones in a reflex arc First Second Third A sensory neuro... show full transcript
Worked Solution & Example Answer:Which row in the table shows the order of neurones an impulse travels through in a reflex arc? Order of neurones in a reflex arc First Second Third A sensory neurone motor neurone relay neurone B motor neurone relay neurone sensory neurone C motor neurone sensory neurone relay neurone D sensory neurone relay neurone motor neurone Your answer - OCR Gateway - GCSE Biology - Question 2 - 2021 - Paper 1
Step 1
Identify the order of neurones in a reflex arc
Answer
In a reflex arc, the order in which an impulse travels is as follows:
- Sensory Neurone: This first neurone receives the stimulus and carries the impulse towards the central nervous system.
- Relay Neurone: The second neurone processes the information within the central nervous system and connects the sensory neurone to the motor neurone.
- Motor Neurone: The third neurone carries the impulse away from the central nervous system to effector organs, such as muscles.
Therefore, the correct sequence that corresponds to this pathway is in option D: sensory neurone -> relay neurone -> motor neurone.