Examine the diagrammatic representation of standard ECG. Select an option with correct matching

Select the option with correct matching –

Given below is the diagrammatic representation of a standard ECG Identify the 'X'

Given below is the diagrammatic representation of a sarcomere. Mark the option with a correct description of the structure labelled as A, B ,C and D in the same.

Given below is the diagrammatic representation of a standard ECG. Label its different peaks

Given below is the diagrammatic representation of a standard ECG.Lable its different peaks.

Given below is the diagrammatic representation of a standard ECG.Lable its different peaks.

Following is the diagrammatic representation of Miller's experiment. What is correct labelling? Choose the correct option.