Question

One complete heartbeat, known as a full cardiac cycle, lasts approximately:

Select one:
a. 0.28 seconds
b. 0.6 seconds
c. 1.8 seconds
d. 0.8 seconds
e. 0.7 seconds

Answer 1

A full cardiac cycle, which includes systole and diastole, typically lasts around 0.8 seconds. The correct option is D.

Step-by-step explanation:

One complete heartbeat, known as a full cardiac cycle, lasts approximately 0.8 seconds. This cycle comprises of two main phases; systole when the heart muscle contracts and pumps blood out of the chambers, and diastole when the heart muscle relaxes and the chambers fill with blood.

Understanding the cardiac cycle is essential for grasping how the heart functions to pump blood efficiently throughout the body.