Final answer:
Bradycardia is a condition in which the resting heart rate drops below 60 bpm. Rates lower than 50 bpm indicate bradycardia and can result in loss of function and unconsciousness.
Step-by-step explanation:
Bradycardia is a condition in which the resting heart rate drops below 60 beats per minute (bpm). For most individuals, heart rates lower than 50 bpm would indicate bradycardia. As rates fall much below this level, the heart would be unable to maintain adequate blood flow to vital tissues, leading to loss of function, unconsciousness, and ultimately death.