Final answer:
The normal resting adult heart rate is within the range of 60 to 100 beats per minute, indicating that option B is the correct answer. Bradycardia occurs when the rate falls below 60 bpm and tachycardia when it is above 100 bpm.
Step-by-step explanation:
The normal resting adult heart rate (HR) falls within the range of 60 to 100 beats per minute (bpm). This indicates that the correct answer to the given options is B. 60 to 100 beats/min. When an adult's resting heart rate drops below 60 bpm, it is referred to as bradycardia, and when it rises above 100 bpm, the condition is known as tachycardia. While bradycardia is not considered clinically significant if no other symptoms are present, it may require a pacemaker or other treatments if it causes symptoms or is due to an underlying cause.
Resting heart rates vary based on exercise, fitness levels, and age. For instance, trained athletes often showcase very low resting HRs. Health factors such as physical condition, mental condition, and sex can influence both heart rate and stroke volume (SV), which is the amount of blood pumped by the left ventricle in one contraction.