Biological Measurement (AQA A-Level Physics): Flashcards
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Practise the cards
10 cards from this deck
ECG displays
ECG displays
Heart's electrical activity as function of time
Electrode type for ECG
Electrode type for ECG
Silver electrodes coated with silver chloride
ECG signal amplitude at skin
ECG signal amplitude at skin
Approximately 1 mV
Mains interference frequency
Mains interference frequency
50 Hz
Duration of complete cardiac cycle
Duration of complete cardiac cycle
Approximately 0.6 seconds
P wave represents
P wave represents
Depolarisation of atrial muscle cells
QRS complex represents
QRS complex represents
Depolarisation of ventricular muscle cells
T wave represents
T wave represents
Repolarisation of ventricular muscle cells
Why high-gain amplifier needed for ECG
Why high-gain amplifier needed for ECG
ECG signals very small (~1 mV), need boosting to measurable levels
Heart action potential duration
Heart action potential duration
Approximately 0.2 s