Lesson 4.5.1

4.5.1 Homeostasis Quiz: AQA Biology, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.5.1, Homeostasis: 20 multiple choice questions for the AQA GCSE Biology (8461), Unit 5: Homeostasis and response, written with Revision Ninja.

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The 20 questions

  1. What term describes the regulation of internal conditions to maintain optimal cell function?

    • Respiration
    • Metabolism
    • Homeostasis
    • Synthesis

  2. Which condition in the human body is controlled by homeostasis?

    • Blood glucose level
    • Blood pressure
    • Breathing rate
    • Heart rate

  3. Which three components are found in all biological control systems?

    • Stimuli, impulses, responses
    • Receptors, nerves, muscles
    • Sensors, conductors, motors
    • Receptors, coordinators, effectors

  4. Which part of a control system detects stimuli?

    • Effectors
    • Hormones
    • Coordination centres
    • Receptors

  5. Which of these is a coordination centre named in the specification?

    • The sweat glands
    • The biceps muscle
    • The retina
    • The pancreas

  6. What is the main function of an effector in a control system?

    • Process receptor information
    • Send electrical impulses
    • Detect environmental stimuli
    • Restore optimum levels

  7. Which two structures act as effectors in the human body?

    • Brain and spinal cord
    • Receptors and neurones
    • Eyes and ears
    • Muscles and glands

  8. What does homeostasis maintain for enzyme action?

    • Extreme acidity
    • Maximum temperature only
    • Zero water content
    • Optimum conditions

  9. Which two types of response are used in automatic control systems?

    • Physical and mechanical
    • Electrical and magnetic
    • Thermal and kinetic
    • Nervous and chemical

  10. What is the main function of a coordination centre in homeostasis?

    • Restore optimum levels
    • Process receptor information
    • Secrete chemical hormones
    • Detect environmental changes

  11. A person sweats after exercise. Which part of the control system is the sweat gland?

    • A neurone
    • A coordination centre
    • A receptor
    • An effector

  12. Which organ acts as a coordination centre for blood glucose control?

    • Pancreas
    • Brain
    • Liver
    • Kidney

  13. What comes immediately after the receptor in a control system sequence?

    • Coordination centre
    • Response
    • Stimulus
    • Effector

  14. In a home heating system, which part functions like a biological receptor?

    • Boiler heating element
    • Temperature sensor
    • Central control box
    • Radiator valve

  15. Why is maintaining optimum body temperature important for enzyme action?

    • Prevents enzyme denaturation
    • Produces extra glucose
    • Increases cell division
    • Stops electrical impulses

  16. A person loses too much water. Which controlled condition is affected?

    • Blood glucose
    • Body temperature only
    • Ovulation
    • Water levels

  17. How do nervous responses compare to chemical responses in homeostasis?

    • Slower and shorter-lasting
    • Faster and longer-lasting
    • Slower and longer-lasting
    • Faster and shorter-lasting

  18. Which component carries out the physical response to restore optimal internal conditions?

    • Stimulus
    • Coordinator
    • Receptor
    • Effector

  19. What is the specific function of receptor cells in homeostasis?

    • Secrete hormones
    • Carry out responses
    • Detect stimuli
    • Process information

  20. What term describes a control system where the response counteracts the original stimulus?

    • Positive feedback
    • Negative feedback
    • Reflex arc
    • Nervous impulse

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