The structure and function of a reflex arc
I can describe what a reflex response is and the path a nerve impulse takes through a reflex arc in the nervous system.
The structure and function of a reflex arc
I can describe what a reflex response is and the path a nerve impulse takes through a reflex arc in the nervous system.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Reflex responses are fast and involuntary, and are essential to the survival of many organisms.
- Reflex responses do not involve a processing centre (e.g. the brain) in the CNS.
- In a reflex arc, the nerve impulse travels across a synapse from the sensory neurone to a relay neurone in the CNS.
- The nerve impulse travels across a synapse from the relay neurone to a motor neurone in the PNS.
- Sometimes the brain can modify (e.g. stop) a reflex response via a neurone to the motor neurone of the reflex arc.
Keywords
Involuntary - Something that occurs without you realising or controlling it.
Reflex response - An involuntary, fast neural response to a situation.
Reflex arc - The fixed neural pathway that controls the reflex response.
Relay neurone - An intermediate neurone that sits within the central nervous system.
Common misconception
What constitutes a reflex response, and how they are generated in the body is often confused and muddled, leading to an incorrect mix between a standard neural pathway and the reflex pathway.
The reflex pathway is clearly stated and explained, and it is compared to the standard neural pathway. Plenty of examples of reflexes are given, including those that occur in other organisms, and there is a quick practical to try too.
To help you plan your year 10 combined science lesson on: The structure and function of a reflex arc, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 combined science lesson on: The structure and function of a reflex arc, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 combined science lessons from the Coordination and control: the human nervous system unit, dive into the full secondary combined science curriculum, or learn more about lesson planning.
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Starter quiz
6 Questions
Exit quiz
6 Questions
