Anatomy & Physiology Cardiac #20

Question

Which is the location where ventricular systole begins?

Answers

  1. The QRS.
    • Rationale:

      The QRS complex that is identified on an EKG represents both atrial repolarization and ventricular depolarization. The QRS is the location where the ventricular systole begins.

  2. The P wave.
    • Rationale:

      The P wave represents the atrial contraction and atrial depolarization during atrial systole.

  3. The T wave.
    • Rationale:

      The T wave represents the repolarization of the heart muscle’s ventricles.

  4. The ST segment.
    • Rationale:

      The ST segment is the space on the EKG between the S and T waves.

Overview

Ventricular systole is defined as the power generating phase of the cardiac cycle. This is when the ventricles are contracting.

Explanation

Learning Outcomes

Specific complexes, segments, and waves are monitored using the electrocardiogram (i.e., EKG) and can be useful in detecting issues and implementing medical care to address cardiac or heart muscle problems. The QRS complex represents both atrial repolarization and ventricular depolarization. The QRS is where ventricular systole begins.

Test Taking Tip

Consider each part of the electrocardiogram to determine the correct choice for this question.

Video Rationale