what happens during a pull action ina heart
During a pull action in the heart, the chambers of the heart contract and relax in a coordinated pattern to pump blood. Let's break down the process step by step:
1. A pull action begins with the contraction of the atria, the two upper chambers of the heart. This contraction, known as atrial systole, pushes blood into the ventricles.
2. As the atria relax, the ventricles contract. This is called ventricular systole. The right ventricle pumps deoxygenated blood into the pulmonary artery, which carries the blood to the lungs for oxygenation. At the same time, the left ventricle pumps oxygenated blood into the aorta, the largest artery in the body, which distributes the blood to the rest of the body.
3. After the ventricles contract, both the atria and ventricles enter a relaxation phase known as diastole. During diastole, the heart chambers fill with blood in preparation for the next cycle.
4. The relaxation of the atria allows blood to flow from the veins into the atria, filling them up. Simultaneously, the relaxation of the ventricles allows blood to flow from the atria into the ventricles, completing the filling of the heart chambers.
This coordinated sequence of contraction and relaxation, commonly known as the cardiac cycle, allows blood to be continuously circulated throughout the body. The heart's pull action ensures that oxygenated blood is delivered to organs and tissues, while deoxygenated blood is carried to the lungs for oxygenation.