CBSE Class 11-science Answered
question no. 19
Asked by itsmepreeti97 | 14 Jun, 2020, 05:40: PM
Expert Answer
ECG or electrocardiogram is the graphical representation of the electrical activity of the heart during a cardiac cycle.
The instrument used to obtain ECG is called an electrocardiograph.
P wave:
- It represents the electrical excitation generated by the SA node which causes the depolarisation of the atria.
- Interval PQ represents the atrial systole.
QRS complex:
- It represents the spread of impulse of contraction from the AV node to the walls of the ventricles which causes depolarisation of the ventricles.
- RS of the QRS complex and ST indicates a ventricular systole.
- One can determine the heartbeatrate of an individual by counting the number of QRS complexes.
T-wave:
- It represents the repolarisation or relaxation of ventricles.
- The end of the T-wave marks the end of systole.
Answered by Sheetal Kolte | 14 Jun, 2020, 08:23: PM
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