This memory aid covers Memory Aids within Homeostasis Intro for GCSE Biology. Topic 1: Homeostasis Intro It is section 10 of 13 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Topic position
Section 10 of 13
Practice
15 questions
Recall
20 flashcards
🧠 Memory Aids
The control loop — "RCE": Receptors Call, Effectors Correct
- Receptor — detects the change and calls for help
- Coordination centre — receives the call and decides what to do
- Effector — carries out the correction
"Negative = Opposite": In any negative feedback question, the effector response must always be in the OPPOSITE direction to the original change. Temperature goes UP → response brings it DOWN. Blood glucose goes DOWN → response brings it UP. This is the entire logic of negative feedback in one word: opposite.
Three variables — TWB:
- Temperature (37°C — enzyme optimum)
- Water balance (osmotic regulation)
- Blood glucose (fuel for respiration)
Nervous vs Endocrine — "Fast Fades, Slow Stays": The nervous system is fast but effects fade quickly. The endocrine (hormonal) system is slower to respond but its effects stay around longer. This is why hormones like insulin are used for sustained blood glucose regulation, not quick nerve impulses.