NEET 2009 Biology question

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

(1)S - start of systole
(2)T - end of diastole
(3)P - depolarisation of the atriaCorrect
(4)R - repolarisation of ventricles

Answer: (3)

Solution

In a standard ECG the P-wave represents atrial depolarisation (which leads to atrial contraction). Hence option (3). The QRS complex represents ventricular depolarisation, with the start of ventricular systole at the beginning of the Q wave

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Question ID VK-090251