GCSE Biology
Homeostasis & Response
Homeostasis & Response is a core strand in Biology. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
Nervous System
The nervous system is a complex network of nerves and cells that transmit signals between different parts of the body.
Open guideReflex Actions
A reflex action is a rapid, automatic response to a stimulus that does not involve conscious thought.
Open guideThe Brain & the Eye
The brain, part of the CNS, is an incredibly complex organ responsible for consciousness, intelligence, memory, and coordinating the body's responses.
Open guideHormonal Coordination
The endocrine system uses chemical messengers called hormones to coordinate bodily functions.
Open guideBlood Glucose Control
The concentration of glucose in the blood is carefully controlled by the hormones insulin and glucagon, which are produced by the pancreas.
Open guideMenstrual Cycle & Fertility
The menstrual cycle is a monthly series of changes a woman's body goes through in preparation for the possibility of pregnancy.
Open guideKidneys & Osmoregulation
The kidneys are vital organs that regulate the water balance of the body (osmoregulation) and excrete waste products like urea.
Open guideTemperature Regulation
The human body maintains a constant internal temperature of around 37°C through thermoregulation, a process involving the brain and skin.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.