Questions: The medical term for an abnormally rapid resting heart rate is Select atrial fibrillation heart failure. tachycardia ventricular fibrillation

The answer is the third one: tachycardia.

Explanation for each option:

1. Atrial fibrillation: This is a condition characterized by an irregular and often rapid heart rate that can lead to poor blood flow. It is not specifically defined as an abnormally rapid resting heart rate, but rather an irregular one.

2. Heart failure: This is a condition where the heart is unable to pump sufficiently to maintain blood flow to meet the body's needs. It is not defined by heart rate alone and does not specifically refer to an abnormally rapid resting heart rate.

3. Tachycardia: This term specifically refers to an abnormally rapid heart rate, typically defined as a resting heart rate over 100 beats per minute in adults. Therefore, it is the correct answer.

4. Ventricular fibrillation: This is a serious cardiac rhythm disturbance where the ventricles quiver ineffectively instead of pumping blood. It is not defined as an abnormally rapid resting heart rate but rather a life-threatening condition requiring immediate medical attention.

In summary, the medical term for an abnormally rapid resting heart rate is tachycardia.