Normal Sinus Rhythm Explained: Heart Anatomy & ECG Interpretation #258150 (License: Personal Use)

This medical illustration depicts the physiological basis of normal sinus rhythm, highlighting the sinoatrial (S-A) node as the natural pacemaker initiating electrical impulses. The accompanying ECG trace shows regular P waves followed by QRS complexes, with amplitude calibrated at 1 mV and time scale at 1.0 s per major division, confirming a heart rate between 60-100 beats per minute. All intervals and waveforms fall within standard clinical norms.

Used in cardiology education, patient handouts, or online health resources to explain healthy cardiac conduction; targets users seeking to understand ECG basics, diagnose rhythm abnormalities, or study for medical exams.