The Electrical Activity Of The Heart
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Describe the steps of the electrical activity of the heart
• The SA node generates impulse; atrial excitation begins • Impulse delayed at AV node • Impulse passes to the heart apex ; ventricular excitation begins • Ventricular excitation complete at the bundle of his or Purkinje fibres
What does myogenic mean?
Originating in the cardiac muscle
What does systolic phase mean?
The phase in the heart when it contracts.
What does diastolic phase mean?
The phase of the heart when it relaxes.
What is the average blood pressure?
120/80 mmgh
What is the full form of mmgh?
Millimetres of mercury
What is the average heart rate?
60- 80 bpm
What is the full form of bpm?
Beats per minute
What are the 3 electrical wave phases?
P wave, QRs complex, T wave
What is p wave?
Atrial contraction / depolarisation
What is QRs complex?
Ventricular contraction / depolarisation
What is T wave?
Ventricular relaxation / repolarisation
Why is ventricular wave larger than atrial wave?
Blood is required to pump further in the ventricles than the atrium so needs a greater excitation.
Why is atrial repolarisation not included?
Takes place at the same time that the ventricular depolarisation takes place.