Final answer:
Tachycardia, bradycardia, and fibrillation are abnormal heart rates that have distinct characteristics and potential symptoms.
Explanation:
Tachycardia: Tachycardia is a condition where the resting heart rate is too fast, exceeding 100 beats per minute. It can lead to symptoms such as dizziness, shortness of breath, and chest pain.
Bradycardia: Bradycardia is the opposite of tachycardia, characterized by a resting heart rate below 60 beats per minute. Symptoms may include weakness, fainting, and chest discomfort.
Fibrillation: Fibrillation refers to the rapid, irregular, and unsynchronized contraction of the heart muscle fibers. It can lead to serious conditions like ventricular fibrillation, requiring immediate medical attention.
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