If the sino-atrial node (SAN) of a healthy individual generates exactly 75 action potentials per minute, what will be the exact duration of a single cardiac cycle in this individual?

Step-by-step solution

The number of action potentials generated by the sino-atrial node (SAN) determines the heart rate, which is the number of heartbeats per minute. Given that the SAN generates 75 action potentials per minute, the heart beats 75 times in 60 seconds. The duration of a single cardiac cycle is the time taken for one complete heartbeat. Duration of one cardiac cycle = 60 seconds 75 beats = 0.80 seconds . Dividing 75 by 60 incorrectly yields 1.25 seconds. Assuming the standard average of 72 beats per minute would incorrect