Who this is for: Cambridge IGCSE Biology (0610) students who want homeostasis in the Coordination topic — negative feedback, blood glucose and body temperature — to become reliable marks, distinct from water-balance homeostasis in Excretion.
What query it owns: how to understand and revise homeostasis in Cambridge IGCSE Biology Coordination and Response.
Why this is safe: this page owns the coordination homeostasis revision-guide angle, while Tutopiya’s Homeostasis subtopic page owns the learning resource and the free Homeostasis quiz owns the practice.

Homeostasis is the maintenance of a constant internal environment despite changes in external conditions. In the Coordination and Response topic, Cambridge IGCSE Biology (0610) focuses on negative feedback controlling blood glucose and body temperature — not water balance (that sits in Excretion). This guide covers the syllabus definitions, feedback loops, and the question types that appear every year.

Key takeaways

• Homeostasis keeps internal conditions stable (e.g. blood glucose, body temperature).
• Negative feedback reverses a change — detects deviation, triggers a corrective response, returns to normal.
• Insulin lowers blood glucose; glucagon raises it — classic negative feedback loop.
• Body temperature is controlled by sweating, shivering, hair erection and blood-vessel diameter changes.
• This Coordination homeostasis page is distinct from Excretion homeostasis flashcards (water/ADH).

What is homeostasis in Cambridge IGCSE Biology?

Homeostasis is the maintenance of a constant internal environment. The body monitors conditions such as blood glucose concentration and core body temperature, detects changes from the set point, and uses negative feedback to bring levels back to normal. Hormones (insulin, glucagon) and nervous responses (sweating, shivering) are the main mechanisms tested in the Coordination topic.

You can read the full explanation, worked examples and notes on Tutopiya’s Homeostasis subtopic page before you attempt questions.

The core ideas you must master

Idea	What it means	How the exam uses it
Constant internal environment	Stable conditions inside the body	”Define homeostasis”
Negative feedback	Response reverses the detected change	”Explain the role of negative feedback”
Blood glucose control	Insulin and glucagon from pancreas	”Describe control of blood glucose”
Temperature control	Mechanisms to lose or gain heat	”Describe how the body cools down”
Set point	Normal level the body maintains	”State what happens when temperature rises”

Blood glucose control — negative feedback

Step	When glucose is too high	When glucose is too low
Detection	Pancreas detects high blood glucose	Pancreas detects low blood glucose
Hormone released	Insulin	Glucagon
Effect	Liver converts glucose → glycogen	Liver converts glycogen → glucose
Result	Blood glucose falls	Blood glucose rises

Body temperature control

Condition	Mechanism	Effect
Too hot	Sweating (evaporation cools skin)	Heat loss
Too hot	Vasodilation (blood vessels widen near skin)	More heat radiated
Too cold	Shivering (muscle contractions)	Heat generated
Too cold	Vasoconstriction (blood vessels narrow)	Less heat lost from skin
Too cold	Hairs stand up (traps insulating air layer)	Reduced heat loss

Homeostasis in past-paper wording: command words that matter

Command word / phrase	What the question wants	Typical homeostasis stem
Define	Precise syllabus definition	”Define homeostasis.”
Describe	Process step by step	”Describe how blood glucose is controlled.”
Explain	Cause and effect	”Explain the role of negative feedback.”
State	Short factual answer	”State two ways the body loses heat.”
Suggest	Apply to new scenario	”Suggest why a fever is a homeostatic failure.”

Worked exam-style stems (how to answer the wording)

1. “Define homeostasis.” Homeostasis is the maintenance of a constant internal environment. Mark-scheme reward: constant internal environment.
2. “Describe how the body responds when blood glucose concentration is too high.” Pancreas secretes insulin → liver converts glucose to glycogen → blood glucose concentration decreases. Reward: hormone named + corrective effect.
3. “Explain how sweating helps control body temperature.” Sweat evaporates from the skin surface → heat is lost from the body → body temperature falls. Reward: evaporation linked to heat loss.

When you can recognise the wording instantly, work the full set on the Coordination and Response topical past paper questions and the Homeostasis quiz to lock the definitions in.

How homeostasis connects to the rest of the syllabus

This Coordination homeostasis topic links to Hormones in Humans (insulin and glucagon). Water-balance homeostasis (ADH, kidney) is covered separately in the Excretion topic via Homeostasis 1 and Homeostasis 2 flashcards. The Cambridge IGCSE Biology resource hub links every subtopic.

Common mistakes students make

• Confusing this Coordination homeostasis with water-balance/ADH homeostasis in Excretion.
• Describing positive feedback when the question asks for negative feedback.
• Confusing insulin and glucagon roles in glucose control loops.
• Listing temperature mechanisms without linking each to heat gain or heat loss.
• Saying homeostasis means conditions never change (it means they are returned to normal).

When you need more support

If homeostasis questions keep costing marks — especially negative feedback loops — work through the Coordination and Response topical past paper questions and the Homeostasis quiz, then get focused help from a Cambridge IGCSE Biology tutor.

Frequently asked questions

Is homeostasis hard in Cambridge IGCSE Biology? The definition is simple, but marks are lost when students mix up Coordination homeostasis (glucose, temperature) with Excretion homeostasis (water balance).

What is negative feedback? A control mechanism that detects a change from normal, triggers a response that reverses the change, and returns conditions to the set point.

What is the difference between insulin and glucagon in homeostasis? Insulin is released when blood glucose is too high; glucagon is released when blood glucose is too low — both are negative feedback hormones.

How do I revise homeostasis effectively? Learn the glucose and temperature loops separately, practise drawing negative feedback cycles, then take the Homeostasis quiz.

Ready to master Cambridge IGCSE Biology homeostasis?

Start with the Homeostasis subtopic page, then book a free trial with a Cambridge IGCSE Biology specialist to turn homeostasis into guaranteed marks.

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