Zoology - Body Fluids and Circulation Question with Solution | TestHub
Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?
Options:
Answer:
Solution:
Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole. The T-wave represents the return of the ventricles from excited to normal state (repolarisation). The end of the T-wave marks the end of systole.
There is one ventricular contraction during one heartbeat, as the heartbeat rate is equal to the pulse rate. Hence, QRS complex represents one complete pulse.
