GCSE Biology (AQA)

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Controlling Heart Rate

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Organisation Animal Tissues, Organs and Organ Systems

Controlling Heart Rate

2:03 Heart Rate and Gaseous Exchange
Spec 4.2.2.2
Previous Heart Circulation Next Lung Anatomy
  • Heart rate, also known as pulse rate, is the number of heartbeats per minute (BPM).
  • You can measure your pulse with your fingers on your wrist or neck.
  • The average heart rate for 14 to 16-year-olds is between 60 and 100 BPM.
  • Heart rate is controlled by a group of cells in the right atrium called pacemaker cells.
  • Pacemaker cells are not a single cell but a group.
  • These cells allow the heart to produce its own contractions independently of the nervous system.
  • Pacemaker cells generate electrical impulses that trigger heart muscle contractions.
  • These electrical impulses spread throughout the heart and can be measured with an ECG (Electrocardiogram).
  • If pacemaker cells malfunction, doctors can use artificial pacemakers.
  • Artificial pacemakers are small devices surgically implanted in the chest, sending electrical signals to control the heartbeat.
  • Artificial pacemakers are crucial for patients whose natural pacemaker cells are not functioning properly.

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