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Question

During QRS wave

A
signals of contraction spread throughout atria
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B
signals of contraction spread throughout ventricles
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C
ventricles return from excited state to normal state
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D
none of these
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Solution

The correct option is B signals of contraction spread throughout ventricles
The QRS wave is considered as a single entity. Q is a small downward deflection, R is a large upright triangular wave, S is the ending downward wave. Impulses from the atrioventricular node travel through the Bundle of His and Purkinje fibres. Signals for contraction spread throughout the ventricles. The contraction starts shortly after Q and marks the beginning of contraction.
Signals for contraction spread throughout the atria during atrial contraction which gives rise to P waves.
T wave is caused due to ventricular relaxation (repolarization) and represents the return of the ventricles from excited to normal state.

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