Respuesta :
Answer
72 beats per minute
Explanation
Resting heart rate refers to the speed of the heart beat, which is the number of heart beats per unit time. The heart rate changes according to the body’s physical requirement such as the need to absorb oxygen and excrete carbon dioxide. A resting heart rate that is between 60 to 100 beats per minute is normal where as 60 to 80 BPM is optimal.