During ventricular systole, which of the following events occurs immediately after the QRS complex on an electrocardiogram?

A Opening of the AV valves

B Ventricular filling

C Isovolumetric contraction

D Opening of the semilunar valves

✓ Correct Answer: Option C

The QRS complex represents ventricular depolarization. Immediately following this, ventricular pressure rises due to contraction while all valves are closed, leading to isovolumetric contraction before the semilunar valves open.

💡 Why is C) the correct answer?

The correct answer to the question "During ventricular systole, which of the following events occurs immediately after the QRS complex on an electrocardiogram?" is Option C: Isovolumetric contraction.

The other options — A) Opening of the AV valves, B) Ventricular filling, D) Opening of the semilunar valves — are incorrect for this USMLE Exam Prep question. As explained above: The QRS complex represents ventricular depolarization. Immediately following this, ventricular pressure rises due to contraction while all valves are closed, leading to isovolumetric contraction befo…

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This 2-level USMLE Exam Prep question from the Step 1 – Basic Sciences topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free USMLE Exam Prep practice test or use flashcards for spaced repetition review.

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During ventricular systole, which of the following events occurs immediately after the QRS complex on an electrocardiogram?

✓ Correct Answer: Option C

📚 About This USMLE Exam Prep Practice Question

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