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Which of the following correctly explain...

Which of the following correctly explains a phase`//`event in cardiac cycle in a standard electrocardiogram

A

QRS complex indicates atrial contraction.

B

QRS complex indicates ventricular contraction.

C

Time between S and T represents atrial systole

D

P-wave indicates beginning of ventricular contraction.

Text Solution

Verified by Experts

The correct Answer is:
B
QRS Complex QRS wave (complex) begins after a fraction of second after the P wave. it begins as a small downward deflection (Q) and continuous as a iarge upright (R) and triangular wave, ending as downward wave (S) at its base.
This represents ventricular depolarisation (ventricular contraction). Thus, the other options are wrong.
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