ANATOMY

Detailed explanation-1: -A healthy human heart beats 72 times per minute which states that there are 72 cardiac cycles per minute. The cardiac cycle involves a complete contraction and relaxation of both the atria and ventricles and the cycle last approximately 0.8 seconds.

Detailed explanation-2: -The cardiac cycle is the term used to describe the relaxation and contraction that occur as the heart works to pump blood through the body. Heart rate is a term used to describe the frequency of the cardiac cycle. It is considered one of the four vital signs and is a regulated variable.

Detailed explanation-3: -One cycle is complete when the heart fills with blood and then ejects the blood. The cardiac cycle has alternating phases of contraction, called systole, and relaxation or diastole. Based on a heart rate of 75 beats per minute, one cycle lasts about 800 milliseconds.

Detailed explanation-4: -The cardiac cycle describes all the activities of the heart through one complete heartbeat-that is, through one contraction and relaxation of both the atria and ventricles. A contraction event (of either the atria or ventricles) is referred to as systole, and a relaxation event is referred to as diastole.