A) rate of heart beat
B) difference in electric potential
C) volume of blood pumped
D) ventricular contraction
Correct Answer: A
Solution :
ECG (Electro Cardio Gram) is a device used to record the electric activity of the heart to detect abnormal electric impulses through the muscle. It allows diagnosis of cardiac abnormalities. In normal heartbeat, 3 successive electrical pulses are recorded. First, there is an atrial excitation caused by the depolarization associated with aterial contraction (P-wave). After this, there is much stronger ventricular excitation, reflecting both the depolarization of the ventricles and the relation of the atria (QRS-wave). Finally, after 0.2 second, there is a third wave caused by the relaxation of the ventricles (T-wave).
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