An adult human has systolic and diastolic pressures as:
80 mm Hg and 120 mm Hg
120 mm Hg and 80 mm Hg
50 mm Hg and 80 mm Hg
80 mm Hg and 80 mm Hg
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In a standard ECG which one of the following alphabets is the correct representation of the respectively activity of the human heart?