Explain the brain coordinating temperature responses
Link detected temperature departures to the appropriate effectors.
Section 14.4 · Homeostasis
Exam scope and assessment notes
Extended only (Supplement) · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- Recall hormone production and blood transport, respiration, liver storage and electrical impulses along neurones.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which organ coordinates the required response?
What you will learn
- Describe temperature detection and coordination
- Choose warm and cold corrective responses
Explain the brain coordinating temperature responses
| Feature | Meaning |
|---|---|
| Coordinator | Brain; hypothalamus region |
| Above reference | Cooling effectors increase |
| Below reference | Heat production and conservation responses |
| Feedback | Return reduces corrective responses |
Describe temperature detection and coordination
The brain coordinates mammalian temperature regulation. A coordinating region, the hypothalamus, monitors internal temperature and receives information about temperature conditions from receptors. Signals from the coordinating system change effector activity. Receptors in the skin can supply information, but the pictured touch receptor in the identification sources is not specifically labelled as a thermoreceptor.
When internal temperature is above its regulated level, the brain coordinates responses such as increased sweating and increased skin surface blood flow. In surroundings cooler than the body, these can increase heat loss. Shivering is reduced rather than selected as the main cooling response, because its muscle activity would generate additional heat.
Choose warm and cold corrective responses
When internal temperature is below its regulated level, the brain coordinates shivering and reduced surface blood flow, with insulating responses relevant to the mammal’s coat. Shivering increases heat production, while the other responses reduce heat loss. The brain is the coordinator rather than the organ that physically secretes sweat or supplies the entire insulating fat layer.
The response directions depend on the departure from the regulated level. As that departure becomes smaller, the corrective responses are reduced through negative feedback. A simplified model may use a supplied reference near 37°C, but this is not an exact universal reading for every person at every time. Use the stated reference in a question and keep the mechanism distinct from clinical assessment.
Pause and explain
Which response set is appropriate after internal temperature falls?
Worked example
Explain the role of the brain after internal temperature rises.
Show the worked solution
- The coordinating brain region detects/receives temperature information.
- It coordinates cooling effectors and reduces the response as temperature returns.
Answer The brain coordinates increased sweating and appropriate increased surface blood flow after a rise; return towards the regulated level reduces the corrective response.
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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.
State the brain’s role in temperature regulation.
Give me a hint
Separate detection/coordination from physical effectors.
Compare my reasoning
- The brain monitors/receives temperature information.
- It coordinates effector responses that oppose the departure.
The brain monitors and receives temperature information and coordinates appropriate effector responses to restore temperature towards its regulated level.
Look for these in your work
- Include temperature information
- Include corrective coordination
Choose and explain one response for high and one for low internal temperature.
Give me a hint
Use opposite correction directions.
Compare my reasoning
- High: sweat evaporation removes heat.
- Low: shivering muscle respiration produces more heat.
High temperature: increased sweat evaporation removes heat. Low temperature: shivering increases respiration and heat production.
Look for these in your work
- Explain the high response
- Explain the low response
Why cannot the source Merkel cell automatically be labelled the thermoreceptor for this brain-control diagram?
Give me a hint
Distinguish a generic identification requirement from specific receptor function.
Compare my reasoning
- The source labels a touch-associated receptor.
- It does not identify a specific temperature detector.
The source supports touch-receptor identification, not a particular thermoreceptor label. The temperature-control model must state its own receptor scope.
Look for these in your work
- Use source-specific evidence
- Avoid unsupported stimulus specificity
Common mistakes
- Saying the brain itself secretes skin sweat.
- Choosing shivering as the main cooling response.
What can you explain now?
Which response set is appropriate after internal temperature falls?
Compare with the explanation
Shivering and reduced surface blood flow
These increase production and reduce loss respectively.
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Make it stick
Describe the brain’s role and choose effectors that oppose the stated departure.
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