Define cardiac cycle
A) Cardiac cycle is the number of heartbeats in one minute.
B) Cardiac cycle is the number of heartbeats in one day.
C) Cardiac cycle is the time it takes one blood cell to make a complete circuit through the systemic and pulmonary circuits.
D) Cardiac cycle is time it takes the entire volume of blood to cycle through the heart.
E) Cardiac cycle is the period between the start of one heartbeat and the beginning of the next.
Answer: E
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