Compare nervous and endocrine coordination
Compare signal form, route, target and typical response time for the two coordination systems.
Section 15.1 · Control and coordination in mammals
A Level; Cambridge International Biology 9700, 2028–2030. Written answers are self-checked; this is not practical-skills certification.
Before you begin
- A control pathway links a stimulus, receptor, coordination system and response.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How does an endocrine signal usually travel to a target cell?
What you will learn
- Compare electrical impulses and neurotransmitters with hormones in blood
- Relate signalling routes to typical response speed, localisation and duration
Nervous and endocrine coordination
| Feature | Meaning |
|---|---|
| Nervous | Electrical impulses along neurones; neurotransmitter at synapses |
| Endocrine | Hormones transported in blood to cells with appropriate receptors |
| Typical pattern | Nervous responses are rapid and localised; endocrine responses are often slower and longer-lasting |
| Examples | ADH, glucagon and insulin are hormones |
Build the mechanism
Nervous coordination uses electrical impulses along neurones and neurotransmitters across synapses. It can communicate rapidly with specific effectors. Endocrine coordination uses hormones carried in blood to target cells with matching receptors; its effects are often slower to begin and longer lasting. These are typical patterns rather than absolute rules, because response speed also depends on the signal, pathway and target.
Keep the sequence precise
Do not describe hormones as travelling along neurones or electrical impulses as moving through blood. A comparison should pair the same feature, such as signal, route, target or time course, for both systems.
Pause and explain
A researcher detects a hormone in blood and a prolonged change in receptor-bearing cells. Explain why this supports endocrine coordination.
Worked example
Compare the signal and route in a motor-neurone response and an endocrine response.
Show the worked solution
- The nervous route uses impulses in neurones and transmitter at a synapse.
- The endocrine route carries a hormone in blood to target cells.
Answer Nervous coordination uses impulses along neurones and neurotransmitter at synapses; endocrine coordination carries hormones in blood to receptor-bearing target cells.
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Compare nervous and endocrine coordination by signal and route.
Give me a hint
Name the first event, then follow each link in order.
Compare my reasoning
- State the signal used by each system.
- State how each signal reaches its target.
Nervous coordination uses electrical impulses along neurones and neurotransmitter at synapses. Endocrine coordination carries hormones in the blood to target cells with suitable receptors.
Look for these in your work
- Mechanism stated
- Steps linked in order
A response is localised, starts quickly and fades shortly after nerve activity stops. Which system is the better fit, and why?
Give me a hint
Use the terms in the question and state what changes.
Compare my reasoning
- Use the response pattern as evidence, not as an absolute rule.
- Relate rapid local signalling to neurones and synapses.
Nervous coordination is a better fit because impulses and synaptic transmission can deliver a rapid, localised signal. The timing is typical evidence, not proof that all nervous responses have the same duration.
Look for these in your work
- Evidence interpreted
- Biological direction explained
A researcher detects a hormone in blood and a prolonged change in receptor-bearing cells. Explain why this supports endocrine coordination.
Give me a hint
Apply the mechanism to the new context without adding unsupported claims.
Compare my reasoning
- Blood can transport hormone beyond the releasing gland.
- Matching receptors make target cells responsive.
A hormone in blood reaching receptor-bearing target cells is an endocrine route. A sustained response is consistent with endocrine action, although timing alone does not identify the system.
Look for these in your work
- Mechanism applied
- Limits preserved
Common mistakes
- Claiming every nervous response is faster than every hormonal response
- Comparing different features in each side of an answer
What can you explain now?
How does an endocrine signal usually travel to a target cell?
Compare with the explanation
In the blood
The hormone circulates and affects cells with appropriate receptors.
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Make it stick
Which paired features distinguish the nervous and endocrine systems?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.