ventilrörelser

Ventilrörelser refers to the coordinated movements of the heart valves that regulate blood flow through the heart. These movements are crucial for ensuring that blood flows in one direction, preventing backflow and maintaining efficient circulation. The two primary phases of the cardiac cycle, diastole and systole, are defined by these valve actions.

During diastole, the heart muscle relaxes, and the atrioventricular valves, the mitral valve between the left atrium and left ventricle, and the tricuspid valve between the right atrium and right ventricle, open. This allows the chambers to fill with blood. Simultaneously, the semilunar valves, the aortic valve between the left ventricle and the aorta, and the pulmonary valve between the right ventricle and the pulmonary artery, remain closed.

Systole is the phase of ventricular contraction. As the ventricles begin to contract, the pressure within them rises. This increased pressure forces the atrioventricular valves to close, preventing blood from returning to the atria. Once the ventricular pressure exceeds the pressure in the aorta and pulmonary artery, the semilunar valves open, allowing blood to be ejected from the ventricles into these major arteries. The precise timing and sequence of these opening and closing events are controlled by electrical signals within the heart and are essential for effective pumping. Abnormalities in ventilrörelser can lead to various heart conditions, including valve regurgitation or stenosis.