Jan 16, 2025 · This article will delve into each phase of the cardiac cycle, shedding light on their roles in maintaining cardiovascular health. Atrial Systole. Atrial systole marks the beginning of the cardiac cycle, where the atria contract to push blood into the ventricles. This contraction is initiated by the sinoatrial node, the heart’s natural pacemaker.

Aug 13, 2023 · The human cardiac cycle can be broken down into four main phases; the atrial systole, the ventricular systole, the atrial diastole, and the ventricular diastole. There is an intermediary phase called the protodiastole phase marking the end of the systole and the beginning of the diastole phase.

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.

Phases of the Cardiac Cycle. At the beginning of the cardiac cycle, both the atria and ventricles are relaxed (diastole). Blood is flowing into the right atrium from the superior and inferior venae cavae and the coronary sinus. Blood flows into the left atrium from the four pulmonary veins.

The different phases of the cardiac cycle involve: Atrial diastole; Atrial systole; Isovolumic contraction; Ventricular ejection; Isovolumic relaxation; Ventricular filling

Sep 10, 2024 · The cardiac cycle is the cyclic process allowing the coordinated and effective blood pumping in the entire organism. Understanding the phases of the cardiac cycle—atrial systole, ventricular systole, and diastole—helps comprehend normal heart function and identify changes in various heart conditions.

May 7, 2022 · The cycle goes in the following order: atrial systole, ventricular systole and diastole. Heart valves open when the pressure of the chamber lying before it is higher than that of the chamber after the valve.

In the following six chapters the individual phases of the cardiac cycle are described. The description contains: . Mechanical events in the heart (the contraction on pictures is represented by a colour change of the myocardium). Pressure and volume changes in …

Sep 25, 2017 · Broadly, the cardiac cycle passes through two phases: Diastole: It is a period of relaxation of the heart chamber when the heart is refilled. Systole: The period of contraction of the heart chamber, and blood is pumped out of the heart.

The Cardiac Cycle. The cardiac cycle is split into 7 phases: 1. Atrial contraction. 2. Isovolumetric contraction. 3. Rapid ejection. 4. Reduced ejection. 5. Isovolumetric relaxation. 6. Rapid filling. 7. Reduced filling Phases 2-4 are systole, and phases 5-1 are diastole.