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Quiz yourself on Nervous SystemGet your flashcardsBuild my revision planTrack my progress⚖️ Voluntary vs Reflex Actions
Both voluntary and reflex actions are controlled by the CNS. The key difference is which part of the CNS is involved and whether the response is conscious.
| Feature | Voluntary Actions | Reflex Actions |
|---|---|---|
| Controlled by | Brain (cerebral cortex) | Spinal cord (or brain stem) |
| Conscious? | Yes — you decide to do it | No — happens automatically |
| Speed | Slower (brain must process and decide) | Very fast (bypasses the brain) |
| Purpose | Allows complex, planned behaviour | Protects the body from harm |
| Examples | Picking up a pen, speaking, walking | Pulling hand from hot surface, pupil reflex |
⚖️ Nervous System vs Endocrine System
| Feature | Nervous System | Endocrine (Hormonal) System |
|---|---|---|
| Signal type | Electrical impulses (along neurones) | Chemical hormones (carried in blood) |
| Speed | Very fast (milliseconds) | Slower (seconds to minutes) |
| Duration | Short-lived (response stops quickly) | Long-lasting (response continues) |
| Target | Precise — acts on a specific muscle or gland | Widespread — acts on many target organs |
| Example | Pulling hand from hot surface | Adrenaline increasing heart rate |
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