The nervous system uses electrical impulses for fast, short responses. The endocrine system uses hormones in the blood for slower responses that last longer.
This lesson follows tracing a reflex arc in the SPM Biology coordination and response chapter.
What does the comparison look like?
| Nervous system | Endocrine system | |
|---|---|---|
| Signal | Electrical impulses | Hormones (chemicals) |
| Carried by | Neurones | Blood |
| Speed | Very fast | Slower |
| Duration of effect | Short | Longer |
| Target | A specific muscle or gland | Target organs and cells with matching receptors |
Write both sides in every comparison sentence.
Worked example: sorting three situations
A student must decide which system controls each situation.
Blinking when dust touches the eye. This is fast and automatic, and it stops when the danger is gone. It is the nervous system.
Growth during the teenage years. The effect builds over months and years, and it reaches many organs. It is the endocrine system, through hormones.
A racing heart after a fright. Nerve impulses act within a moment, and adrenaline released into the blood keeps the heart rate up for longer. Both systems work together.
The mistake that costs marks
The common slip is to claim that hormones act faster than nerves, or to describe only one system when the question asks for a comparison.
| Wrong | Right | |
|---|---|---|
| Speed | Hormones are faster | Nerves are faster, hormones are slower |
| Comparison | “Nerves use impulses.” | “Nerves use impulses, but hormones are chemicals in the blood.” |
| Target | Hormones reach one muscle | Hormones reach all organs with the matching receptors |
A comparison mark needs both systems in one statement, joined by “but” or “whereas”.
Check yourself
State two differences between the nervous and endocrine systems.
Answer
- The nervous system sends electrical impulses along neurones, but the endocrine system releases hormones into the blood.
- The nervous system gives a fast, short-lived response, whereas the endocrine system gives a slower, longer-lasting response.
What to study next
Continue with explaining synaptic transmission within syllabus scope. Practise with the biological data interpretation trainer, and log slips in the mistake log and paper-error review.
If you would like a teacher to check your comparison sentences, see online one-to-one Biology tuition.