In this audio, the distinct and rhythmic sound of an authentic human heartbeat is vividly captured. The pulsating rhythm resonates with the steady, lub-dub beat that is characteristic of a functioning human heart. The sound, real and unfiltered, is reminiscent of listening through a stethoscope during a medical examination. The beat alternates, a clear representation of the heart's dual action of contraction and relaxation - systole and diastole. It's a pure, undisturbed sound that provides an intimate glimpse into the inner workings of the human body, offering an auditory experience that is both fascinating and enlightening.