Given below is the diagrammatic sketch of a standard ECG. Identify the parts labeled P, Q, R, S, and T and select the right option about them.

P-Atrial polarization, QRS- Ventricular systole, T-Atrial systole

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P-Atrial systole, QRS-Ventricular systole, T- Atrial diastole

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P-Atrial systole, QRS-Beginning of ventricular systole, T-End of ventricular systole

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P- Atrial diastole, QRS-Ventricular systole, T-Ventricular diastole

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Solution

The correct option is C P-Atrial systole, QRS-Ventricular systole, T- Atrial diastole
The P peak of ECG represents the Atrial depolarisation i.e. Atrial activation. It is followed by atrial systole. QRS represents depolarization of ventricles i.e. ventricular systole and T is Atrial diastole or repolarisation.
So, the correct option is 'P-Atrial systole, QRS-Ventricular systole, T-Atrial diastole'.

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Q. Arrange the following events in the correct order.

I. Atrial systole
II. Ventricular diastole
III. Joint diastole
IV. Ventricular systole
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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.

Q. Choose the correct sequence of events in the cardiac cycle:
I. Ventricular systole
II. Blood reaches ventricles
III. A-V valves closes
IV. Atrial systole
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VI. Blood goes to major arteries
VII. Semilunar valve opens
VII. Ventricular diastole

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Q. Which of the following events does not take place during a ventricular systole
i. Due to the ventricular systole, ventricular pressure decreases.
ii. During the end of ventricular systole the semilunar valves open up.
iii. During the start of the ventricular systole the bicuspid and tricuspid valves close
iv. Due to the closure of the atrio-ventricular valves, dup sound is produced.

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