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  1. Oct 30, 2023 · The cardiac cycle is defined as a sequence of alternating contraction and relaxation of the atria and ventricles in order to pump blood throughout the body. It starts at the beginning of one heartbeat and ends at the beginning of another. The process begins as early as the 4th gestational week when the heart first begins contracting.

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  2. Nov 11, 2019 · The cardiac cycle is the sequence of events that occurs when the heart beats. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle: The diastole phase and the systole phase. In the diastole phase, heart ventricles relax and the heart fills with blood.

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    • Atrial Systole. This phase is also known as presystole or the last rapid filling phage or atrial kick and is the phase when the atria contract to pump the blood out of the atria into the ventricles.
    • Ventricular Systole. It is the stage when the ventricle contracts expelling the blood outside of the ventricles. The Purkinje fibers relay the cardiac impulses all over the ventricular wall stimulating the ventricular wall to contract.
    • Protodiastole. It is the intermediary stage which indicates the end of systole and the beginning of the diastole stage. The ventricular ejection will have completely reduced the ventricular pressure making it lower than the blood pressure inside the major arteries.
    • Atrial Diastole. It is the stage when the atria are filled. During this stage, the AV valves are closed and the superior and the inferior vena cava pours in the deoxygenated blood collected from the body tissue to the right atrium; whereas the pulmonary veins bring the re-oxygenated (purified) blood to the left atrium.
  3. Relate the heart sounds to the events of the cardiac cycle. The period from the start of one heartbeat to the start of the next, including both systole and diastole phases is known as the cardiac cycle. The contraction phase of the heart, during which blood is pumped into circulation is called systole. The relaxation phase of the heart, during ...

  4. The cardiac cycle refers to the sequence of events that occur when the heart beats. It is the complete cycle of filling and emptying the heart of blood because of heart muscle contraction. The cardiac cycle consists of two main phases: Diastole Phase: During this phase, the heart ventricles are relaxed and the heart fills with blood. The ...

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  6. Relate heart sounds detected by auscultation to action of heart’s valves. The period of time that begins with contraction of the atria and ends with ventricular relaxation is known as the cardiac cycle. The period of contraction that the heart undergoes while it pumps blood into circulation is called systole.

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