This key facts covers Negative Feedback within Water Regulation for GCSE Biology. Topic 7: Water Regulation It is section 3 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 3 of 11
Practice
15 questions
Recall
20 flashcards
📌 Negative Feedback
Most homeostatic systems work by negative feedback:
- Receptor detects a change (stimulus)
- Information sent to coordination centre (brain, spinal cord, pancreas)
- Effector (muscle or gland) produces a response
- Response counteracts the original change
- Levels return to normal
It's called "negative" because the response is OPPOSITE to the change!
Negative feedback works like your home thermostat. Set it to 20°C. If the room gets too cold, the heating turns ON. If it gets too hot, the heating turns OFF. The response always OPPOSES the change to bring things back to normal!
Visual: The Kidney & Nephron
Remember: Nephron: Filtration → Selective Reabsorption → Excretion | ADH controls water balance | Glucose in urine = diabetes