How It Works: Negative Feedback Loops
Part of Homeostasis Intro — GCSE Biology
This how it works covers How It Works: Negative Feedback Loops within Homeostasis Intro for GCSE Biology. Topic 1: Homeostasis Intro It is section 10 of 16 in this topic. Use this how it works to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 16
Practice
15 questions
Recall
20 flashcards
How It Works: Negative Feedback Loops
Every homeostatic system in your body follows the same basic pattern: a stimulus causes a change from the normal level, a receptor detects that change and sends a signal to the coordination centre, the coordination centre processes the information and sends instructions to an effector, and the effector produces a response that opposes and reverses the original change. This is why it is called negative feedback — the response is always in the opposite direction to the initial change.
Consider body temperature as a clear example. If your core temperature rises above 37°C, thermoreceptors in the skin and the hypothalamus detect the increase. The hypothalamus (coordination centre) triggers effectors such as sweat glands and blood vessels in the skin. Sweating and vasodilation cool the body down, opposing the temperature rise. Once temperature returns to normal, the stimulus disappears and the effector responses stop. The system is self-regulating and self-correcting.
This pattern — stimulus → receptor → coordination centre → effector → response → return to normal — applies equally to blood glucose regulation, water balance, and all other homeostatic mechanisms. Recognising this general model means you can apply it to any new context presented in the exam.