What is the QRS complex?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

What is the QRS complex?

Explanation:
The QRS complex shows ventricular depolarization, which triggers the ventricles to contract (ventricular systole). On the ECG, this rapid set of waves comes after the atrial depolarization portion (the P wave) and before the ventricular relaxation (the T wave). When the ventricles depolarize, they contract and push blood into the lungs and the rest of the body. The other options describe atrial activity or ventricular relaxation, which are represented by other parts of the ECG—the P waves for atrial contraction and the T wave for ventricular relaxation—while the QRS is specifically the electrical event that leads to the ventricles contracting.

The QRS complex shows ventricular depolarization, which triggers the ventricles to contract (ventricular systole). On the ECG, this rapid set of waves comes after the atrial depolarization portion (the P wave) and before the ventricular relaxation (the T wave). When the ventricles depolarize, they contract and push blood into the lungs and the rest of the body. The other options describe atrial activity or ventricular relaxation, which are represented by other parts of the ECG—the P waves for atrial contraction and the T wave for ventricular relaxation—while the QRS is specifically the electrical event that leads to the ventricles contracting.

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