Ventricular muscle depolarization is indicated by ___________.

P wave

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QRS complex

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PR interval

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T wave

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Solution

The correct option is B QRS complex
ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle.
P wave in the ECG represents the electrical excitation of the atria (depolarisation) which causes contraction of both the atria. The QRS wave represents the depolarisation of the ventricles, which causes the ventricular contraction.
Contraction starts shortly after the Q wave and marks the beginning of systole (ventricles). The T wave represents the return of ventricles from excited to normal state (repolarisation). The end of the T wave marks the end of the systole.

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Similar questions

Which of the following correctly explains a phase/event in the 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 the beginning of ventricular contraction.

Match column I with column II regarding the standard ECG of a normal person.
$\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & P - w a v e & (i) & A t r i a l d e p o l a r i z a t i o n (b) & Q R S w a v e & (i i) & V e n t r i c u l a r d e p o l a r i z a t i o n (c) & T w a v e & (i i i) & V e n t r i c u l a r r e p o l a r i s a t i o n \end{matrix}$

Q. Depolarization of a stimulated nerve is maintained by

Q. Assertion :A neuron chemically communicates with a myocyte by releasing acetylcholine into the myoneural junction. Reason: Acetylcholine diffuses across the nerve-muscle synaptic-cleft and binds to receptors on the sarcolemma which gets depolarized.

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