$QRS$ complex is related to

How will you interpret an electrocardiogram $(ECG)$ in which the time taken in the $QRS$ complex is higher?

Normal diastolic pressure in a young man is about (in $,\text{mm Hg}$)

Arrange and select the following events in the correct sequence during the measurement of blood pressure by a sphygmomanometer.
$i.$ Pulsatile sound disappears.
$ii.$ Cuff is inflated to block the brachial artery by external pressure.
$iii.$ First pulsatile sound is heard indicating systolic pressure.
$iv.$ Pressure in the cuff is slowly lowered.
$v.$ Cuff is wrapped tightly around the upper arm.

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

The given diagram represents a normal $ECG$ record of a human heart. Select the $CORRECT$ match from the options given below: