A slowed heart rate is referred to as__________?
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Answer: A. Bradycardia
Explanation
Bradycardia is the medical term describing a slower than normal resting heart rate. A heart rate falling below normal physiological thresholds indicates reduced electrical pacemaker activity. Physicians diagnose this condition when resting ventricular contractions drop below standard limits. Normal resting heart rates for healthy adult humans typically range from sixty to one hundred beats per minute. The sinoatrial node acts as the natural pacemaker generating electrical impulses for cardiac contraction. Trained endurance athletes often exhibit physiological bradycardia due to strong stroke volume efficiency.
Pathological bradycardia can cause dizziness, fatigue, and fainting due to inadequate blood perfusion. Patients with severe conduction system defects often require electronic artificial pacemaker implantation. Electrocardiograms help cardiologists evaluate electrical abnormalities responsible for slow heart rhythms. Tachycardia refers to an abnormally rapid resting heart rate exceeding normal limits. Braditachycardia is a combined rhythm disorder like sick sinus syndrome rather than simple slow heart rate. Non of these is incorrect because bradycardia is definitively the correct medical term.
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