Homeostasis & ResponseKey Facts
Key Facts and Numbers to Know
Part of Homeostasis Intro — GCSE Biology
This key facts covers Key Facts and Numbers to Know within Homeostasis Intro for GCSE Biology. Topic 1: Homeostasis Intro It is section 8 of 13 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 8 of 13
Practice
15 questions
Recall
20 flashcards
📋 Key Facts and Numbers to Know
- Normal core body temperature: 37°C (the optimum for most human enzymes)
- Normal blood glucose range: approximately 4–8 mmol/L (rises after meals, falls during exercise, then corrected)
- Normal blood pH range: 7.35–7.45 (maintained largely by the lungs and kidneys)
- The three main variables controlled: temperature, blood glucose, water balance
- Every control system has the same three components: receptor → coordination centre → effector
- Negative feedback responses are always opposite in direction to the original change
- The nervous system is faster but shorter-lived; the endocrine system is slower but longer-lasting
- Enzymes denature at temperatures significantly above 37°C — the active site changes shape permanently
- Different coordination centres handle different variables: hypothalamus (temperature), pancreas (blood glucose), kidneys (water balance)