When the heart beat is too high it is called ______.

Explanation

1. Generally heart rate is low when resting. It's a sign of good health,
2.  When it is too low the condition is called bradycardia. 
3. Normally, the heart beats 60 to 100 times a minute when you are at rest. 
4. But with bradycardia, it goes down to less than 60 beats a minute.