Control of heart rate

Control of heart rate Quiz

Spec 9.8 · Edexcel A-Level Biology B: Quiz

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5 questions, one answer each

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  1. 1. Which neurotransmitter does the vagus nerve release at the SAN?

    • A. Noradrenaline
    • B. Acetylcholine
    • C. Adrenaline
    • D. Dopamine

  2. 2. Blood pressure in the carotid arteries rises. What happens next?

    • A. Baroreceptors send fewer impulses and heart rate rises
    • B. Chemoreceptors send more impulses and heart rate rises
    • C. Baroreceptors send more impulses and the vagus nerve slows the heart rate
    • D. Adrenaline is released and heart rate rises

  3. 3. Which pair correctly names the receptors in the carotid bodies and aorta, and those in the aortic arch and carotid sinus, in that order?

    • A. Baroreceptors then chemoreceptors
    • B. Chemoreceptors then baroreceptors
    • C. Osmoreceptors then baroreceptors
    • D. Chemoreceptors then thermoreceptors

  4. 4. Why does heart rate stay raised after a fright has passed?

    • A. The vagus nerve releases noradrenaline for longer
    • B. Adrenaline remains in the blood until it is broken down
    • C. The SAN stops being myogenic
    • D. Baroreceptors cease to function

  5. 5. A patient's transplanted heart has no nerve supply. Which resting rate is expected?

    • A. About 40 beats per minute
    • B. About 70 beats per minute
    • C. About 100 beats per minute
    • D. About 180 beats per minute

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