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The four phases of the cardiac cycle are diastole, isovolumetric contraction, systole, and isovolumetric relaxation. During diastole, the heart muscles relax and the chambers fill with blood. In isovolumetric contraction, the heart muscles contract but the chambers do not change volume. Systole is when the chambers contract and blood is ejected. Finally, isovolumetric relaxation is when the heart relaxes but the chambers do not change volume.
That is the lunar cycle, or the phases.
29.53 days (rounded)
approximately 29.531 days
The cause of the phases of the Moon is closely related to our calendar month. (moon-th). The phases of the Moon are related to the Moon's orbit of Earth.