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This lesson covers reflex actions and reflex arcs as required by the Edexcel GCSE Combined Science specification (1SC0). You need to understand the reflex arc pathway, explain why reflexes are important and describe examples of reflex actions.
A reflex action is a rapid, automatic response to a stimulus that does not involve conscious thought. Reflexes are:
Examples of reflex actions:
| Stimulus | Reflex Response | Purpose |
|---|---|---|
| Touching a hot object | Hand pulled away | Prevents burns |
| Bright light shining in eye | Pupil constricts | Protects retina from damage |
| Object flying towards face | Eyes blink | Protects eyes |
| Food at the back of throat | Swallowing | Prevents choking |
| Stepping on a sharp object | Foot lifted | Prevents injury |
| Tapping below the kneecap | Knee jerks forward | Tests spinal cord function (knee-jerk reflex) |
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