Edexcel A Level Biology A (Salters-Nuffield)
Edexcel A Level Biology A (Salters-Nuffield) Topic 7: Homeostasis and Thermoregulation Exam Questions
Free Edexcel A Level Biology A (Salters-Nuffield) exam questions on Topic 7: Homeostasis and Thermoregulation, with mark schemes. Covers negative feedback, thermoregulation, the hypothalamus and the effects of exercise on health.
Topic 7: Homeostasis and Thermoregulation exam questions
These packs of real past exam questions cover the whole of Topic 7: Run for Your Life, including Topic 7: Homeostasis and Thermoregulation. Work through every question on this sub-topic, then mark your answers against the mark scheme.
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Edexcel A Level Biology A (SNAB) 9BN0 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About Edexcel A Level Biology A (Salters-Nuffield) Topic 7: Homeostasis and Thermoregulation
This part of Topic 7 covers how the body keeps conditions stable. Expect questions on responses to temperature change.
What you need to know
- Homeostasis Maintaining a stable internal environment using negative feedback.
- Thermoregulation The hypothalamus detects changes and triggers sweating, vasodilation, shivering or vasoconstriction.
- Exercise and health Moderate exercise reduces disease risk; excessive exercise can damage joints and suppress the immune system.
- Performance-enhancing drugs Erythropoietin, steroids and creatine, and the ethics of their use.
Common mistakes in Topic 7: Homeostasis and Thermoregulation
- Saying blood vessels move closer to the skin.
- Confusing positive and negative feedback.
- Ignoring ethics when discussing drugs in sport.
Try three Topic 7: Homeostasis and Thermoregulation exam-style questions
1. Explain how vasodilation reduces body temperature. (2 marks)
Show the mark scheme answer
Arterioles near the skin dilate so more blood flows near the surface (1), increasing heat loss by radiation (1).
2. Define negative feedback. (2 marks)
Show the mark scheme answer
A change from the set point is detected (1) and a response reverses the change, returning to the set point (1).
3. Give one possible health risk of excessive exercise. (1 mark)
Show the mark scheme answer
Any one: joint damage, suppressed immune system.
Topic 7: Homeostasis and Thermoregulation FAQs
What does this part of SNAB Topic 7 cover?
Homeostasis, thermoregulation, exercise and health, and performance-enhancing drugs.
Where is temperature monitored?
The hypothalamus, using thermoreceptors in the skin and blood.
How should I discuss drugs in sport?
Give arguments for and against their use and consider fairness and health risks.
Revise this topic with flashcards: Edexcel A Level Biology A (SNAB) 9BN0 Flashcards, with mark scheme answers for Anki and Quizlet.
