An abnormally slow heartbeat is called:
A) bradycardia.
B) tachycardia.
C) fibrillation.
D) murmur.
A
Explanation:
A) Correct.
B) Tachycardia is an abnormally rapid heartbeat.
C) Fibrillation is a condition in which the heart quivers with a disorganized rhythm.
D) A murmur is an abnormal heart sound.
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