On earth, the normal rate of heart beat ranges per minute from:
70 - 72 times
74 - 76 times
72 - 74 times
68 - 70 times
The heart beats 72 times per minute. The number of times the heart beats in 4 minutes = ?
The work done by the heart is 1 joule per beat. Calculate the power of the heart, if it beats 72 times in one minute.