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This lesson covers reflex actions — rapid, automatic responses that protect the body from harm. Understanding the reflex arc is a key part of the AQA GCSE Biology specification and a very commonly tested topic. This lesson also includes the Required Practical on measuring reaction time.
A reflex action is a rapid, involuntary (automatic) response to a stimulus. Reflex actions are designed to protect the body from danger and do not involve conscious thought — the brain is not involved in the decision to respond.
| Feature | Description |
|---|---|
| Speed | Extremely fast — typically less than a second |
| Control | Involuntary — you cannot consciously prevent the reflex |
| Purpose | Protective — prevents injury or harm |
| Pathway | Uses a reflex arc that bypasses the brain for the initial response |
| Reproducibility | Always produces the same response to the same stimulus |
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