P3.13 ECGs and Pulse Oximetry

P3.13 from the EDEXCEL GCSE SCIENCE EXTENSION UNITS STUDENT BOOK.

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  • ECGs and Pulse Oximetry
    • An action potential is sent to each muscle cell to tell it to contract.
      • This makes the the heart pump at the right time.
    • The body contains high proportion of salt water
      • This means it will conduct electricity.
    • An ECG is a picture of the heart electrical signals.
      • when the heart is beating normally, it has a regular pattern
        • you can work  out the average time period for a heartbeat is
          • frequency= 1/time period (second)
            • The number of heartbeats is normally measured per minute, so x60.
    • Pulse Oximetry
      • A pulse oximeter consists of an red light and infrared light
        • Oxygenated blood absorbs more infra red light  then deoxygenated blood
          • by looking at peaks of infrared absorption, the pulse can be worked out.
    • Pacemakers
      • helps the heart to beat regularly

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