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Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation3 Marks
Question
What is an electrocardiogram? What do P wave and QRS complex represent in a standard ECG?
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Answer

  • An electrocardiogram is the graphic record of the electrical potential differences produced by the cardiac muscles during a cardiac cycle.
  • The P wave represents the depolarisation of atria, which leads to atrial systole.
  • The QRS complex represents the depolarisation of the ventricles that leads to ventricular systole.

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