4.5.1 · Homeostasis
What is homeostasis?
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The regulation of the internal conditions of a cell or organism to keep conditions right for enzyme action and all cell functions, in response to internal and external changes.
AQA GCSE Biology · Topic 5
Homeostasis & Response flashcards
56 cards on Homeostasis & Response, every one written against a numbered point in section 4.5 of the AQA Biology spec. Here’s what the topic covers, and 4 cards to try.
- 56Flashcards
- 11Sub-topics
- 12Higher only
- 27Triple only
Try 4 cards from Homeostasis & Response.
Answer each one in your head, then check. In the app, how well you knew it decides when you see it again.
4.5.2.1 · The Nervous System
What does the nervous system do?
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It lets organisms react to their surroundings and coordinate their behaviour. Information travels as electrical impulses along neurones.
4.5.3.4 · Reproductive Hormones
What are the main reproductive hormones in males and females?
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Males: testosterone, made in the testes; it stimulates sperm production. Females: oestrogen, made in the ovaries. At puberty these hormones cause secondary sex characteristics to develop.
4.5.3.5–4.5.3.6 · Contraception & Infertility
How do hormonal contraceptives work?
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The oral pill contains oestrogen and progesterone (or progesterone only), which inhibit FSH so no eggs mature. Implants, injections and skin patches release progesterone slowly to stop eggs maturing and release, for months or years.
- +52more Homeostasis & Response cards in the app, shown to you just before you’d forget them.Join the waitlist →
What’s in Homeostasis & Response?
Every part of section 4.5 of the AQA spec, and how many cards cover it. Higher-only cards are hidden for Foundation students. Cards only on the separate Biology GCSE are hidden for Combined Science.
- 4.5.1Homeostasis3 cards
- 4.5.2.1The Nervous System7 cards
- 4.5.2.2The BrainTriple only3 cards
- 4.5.2.3The EyeTriple only7 cards
- 4.5.2.4Control of Body TemperatureTriple only3 cards
- 4.5.3.1–4.5.3.2Hormones & Blood Glucose7 cards
- 4.5.3.3Water Balance & the KidneysTriple only7 cards
- 4.5.3.4Reproductive Hormones4 cards
- 4.5.3.5–4.5.3.6Contraception & Infertility5 cards
- 4.5.3.7Adrenaline & Thyroxine3 cards
- 4.5.4Plant HormonesTriple only7 cards
Required practicals in this topic.
The method, the variables and a worked example for each.
Launching November 2026
The other 52 cards are in the app.
revolve. shows you each Homeostasis & Response card just before you’d forget it, so ten minutes a day is enough. It opens to students soon: join the waitlist and we’ll email you once, when it does.