Lesson 3.6.1.3.1

3.6.1.3.1 Control of heart rate by chemoreceptors and pressure receptors Quiz: AQA Biology, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.6.1.3.1, Control of heart rate by chemoreceptors and pressure receptors: 20 multiple choice questions for the AQA Biology (7402), Unit 6: Organisms respond to changes in their internal and external environments, written with Revision Ninja.

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The 20 questions

  1. Which structure acts as the pacemaker of the heart?

    • Purkyne tissue
    • Sinoatrial node (SAN)
    • Bundle of His
    • Atrioventricular node (AVN)

  2. Why does the atrioventricular node delay the electrical impulse before passing it onwards?

    • Heart rate increases
    • AV valves close
    • Ventricles contract first
    • Atria empty completely

  3. What is the role of Purkyne tissue in the human heart?

    • Conducts wave rapidly
    • Initiates the heartbeat
    • Delays electrical signals
    • Contracts atrial muscle

  4. What does it mean that cardiac muscle contraction is myogenic?

    • Stimulated by hormones
    • Requires nervous impulses
    • Controlled by brain
    • Initiated within muscle

  5. Where are the chemoreceptors involved in heart rate control located?

    • SAN and AVN
    • Ventricle walls
    • Medulla oblongata
    • Aorta and carotid

  6. Which part of the autonomic nervous system increases heart rate?

    • Central system
    • Somatic system
    • Parasympathetic system
    • Sympathetic system

  7. A person's heart rate is 70 beats per minute and stroke volume is 70 cm^3. What is the cardiac output?

    • 70 cm^3 per minute
    • 4900 cm^3 per minute
    • 140 cm^3 per minute
    • 490 cm^3 per minute

  8. A heart rate of 90 beats per minute and a stroke volume of 60 cm^3 gives a cardiac output of how many cm^3 per minute?

    • 540
    • 30
    • 150
    • 5400

  9. How does high blood carbon dioxide concentration affect heart rate?

    • Stroke volume decreases
    • Heart rate stops
    • Heart rate decreases
    • Heart rate increases

  10. How does high blood pressure in the carotid arteries affect heart rate?

    • Stroke volume increases
    • No change occurs
    • Heart rate decreases
    • Heart rate increases

  11. What happens to heart rate if sympathetic nerves to the heart are blocked?

    • Heart rate increases
    • Heart rate fluctuates
    • Heart rate decreases
    • Heartbeat stops entirely

  12. Where is the bundle of His located within the heart?

    • In the septum
    • Epicardium surface
    • Atrial walls
    • Purkyne tissue

  13. What is the correct pathway of electrical activity in the heart?

    • SAN, AVN, His, Purkyne
    • Purkyne, AVN, His, SAN
    • AVN, SAN, Purkyne, His
    • SAN, His, AVN, Purkyne

  14. What is the main purpose of the electrical delay at the AVN?

    • Prevents atrial contraction
    • Contracts the valves
    • Increases heart rate
    • Allows ventricles to fill

  15. Which term describes cardiac muscle initiating its own contraction without nerve input?

    • Neurogenic
    • Autonomic
    • Myogenic
    • Reflexive

  16. Which brain region contains the cardiovascular centre controlling heart rate?

    • Hypothalamus
    • Cerebellum
    • Cerebrum
    • Medulla oblongata

  17. What mainly limits the maximum stroke volume during cardiac contraction?

    • Atrial blood pressure
    • Sinoatrial node rate
    • Aortic diameter
    • Ventricular filling volume

  18. What effect does parasympathetic nervous system stimulation have on heart rate?

    • Stops contraction
    • Has no effect
    • Decreases heart rate
    • Increases heart rate

  19. Which node lies at the junction of the atria and ventricles and delays the wave of electrical activity?

    • Atrioventricular node (AVN)
    • Bundle of His
    • Sinoatrial node (SAN)
    • Carotid sinus

  20. Which change in blood concentration is directly detected by chemoreceptors?

    • Decreased pH
    • Increased oxygen level
    • Increased glucose level
    • Decreased temperature

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