P3.13 ECGs and Pulse Oximetry
P3.13 from the EDEXCEL GCSE SCIENCE EXTENSION UNITS STUDENT BOOK.
- Created by: Charlotte Hewitt
- Created on: 31-05-13 17:01
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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.
- frequency= 1/time period (second)
- you can work out the average time period for a heartbeat is
- when the heart is beating normally, it has a regular pattern
- 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.
- Oxygenated blood absorbs more infra red light then deoxygenated blood
- A pulse oximeter consists of an red light and infrared light
- Pacemakers
- helps the heart to beat regularly
- An action potential is sent to each muscle cell to tell it to contract.
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