Lesson 4.5.1

4.5.1 Homeostasis Quiz: AQA Combined Science, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 4.5.1, Homeostasis: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 5: Homeostasis and response, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. What is the primary definition of homeostasis?

    • Regulating internal conditions
    • Digesting food molecules
    • Releasing waste gases
    • Transporting blood cells

  2. Which factor is controlled by homeostatic mechanisms in the body?

    • Lung capacity size
    • Blood glucose concentration
    • Stomach acid volume
    • Heart rate speed

  3. Which part of a control system detects changes in the environment?

    • Coordination centre
    • Muscle fibre
    • Receptor
    • Effector

  4. Which of these is a coordination centre named in the spec?

    • Skin
    • Pancreas
    • Nose
    • Muscle

  5. Which structures act as effectors in a human control system?

    • Brain and spinal cord
    • Muscles or glands
    • Sensory neurones
    • Receptor cells

  6. What does homeostasis maintain optimal conditions for within cells?

    • Enzyme action
    • Protein synthesis only
    • Active transport only
    • Cell division only

  7. What type of responses can automatic control systems involve?

    • Nervous or chemical
    • Magnetic or electrical
    • Physical or thermal
    • Mechanical or kinetic

  8. Which of these is an example of a stimulus?

    • A change in temperature
    • A hormone being released
    • A muscle contracting
    • A glucose molecule

  9. What is the function of receptor cells in a control system?

    • Detect stimuli
    • Bring about responses
    • Release hormones
    • Process information

  10. Which organ acts as a coordination centre for controlling blood glucose?

    • Heart
    • Pancreas
    • Kidney
    • Stomach

  11. Sweat glands release sweat to cool the body. What type of component are they?

    • Stimuli
    • Effectors
    • Receptors
    • Coordination centres

  12. What is the correct order of components in a control system?

    • Coordinator, effector, receptor
    • Receptor, effector, coordinator
    • Effector, receptor, coordinator
    • Receptor, coordinator, effector

  13. Why must internal conditions like body temperature be kept within narrow limits?

    • To absorb oxygen
    • To digest proteins
    • For enzyme function
    • To produce glucose

  14. Which of the following is an automatic homeostatic control?

    • Conscious breathing
    • Body temperature
    • Voluntary speech
    • Skeletal movement

  15. Which two physical and chemical limits must cells constantly maintain?

    • Pressure and mass
    • Volume and density
    • Velocity and force
    • Temperature and pH

  16. What is the primary function of homeostatic control systems in the body?

    • Increase metabolic rate
    • Generate electrical energy
    • Restore optimum conditions
    • Detect external hazards

  17. How do nervous responses differ from chemical responses in homeostasis?

    • Slow and long-lasting
    • Fast and long-lasting
    • Slow and short-lived
    • Fast and short-lived

  18. What is the primary role of a coordination centre in homeostasis?

    • Process receptor information
    • Produce excess hormones
    • Bring about muscle responses
    • Detect environmental stimuli

  19. What is a likely consequence if water level homeostasis fails in human cells?

    • Enhanced enzyme activity
    • Accelerated mitosis
    • Increased respiration
    • Cell damage

  20. Where do internal changes originate in an organism?

    • The external surroundings
    • Atmospheric pressure
    • Within the body
    • Dietary intake only

All AQA Combined Science quizzes