südameaktiivsust

Südameaktiivsus refers to the electrical and mechanical activity of the heart. The heart is a muscular organ responsible for pumping blood throughout the body. This pumping action is a complex process regulated by a coordinated series of electrical impulses and muscle contractions.

The electrical activity of the heart originates in the sinoatrial (SA) node, often called the heart's natural pacemaker, located in the upper right atrium. From the SA node, an electrical impulse spreads through the atria, causing them to contract and pump blood into the ventricles. The impulse then travels to the atrioventricular (AV) node, where it is briefly delayed, allowing the ventricles to fill completely.

Following the delay at the AV node, the electrical signal is rapidly conducted through the ventricles via the bundle of His and Purkinje fibers. This triggers the ventricular muscle to contract forcefully, pumping oxygenated blood to the rest of the body and deoxygenated blood to the lungs. The sequence of electrical activation dictates the sequence of mechanical contraction, ensuring efficient blood circulation.

The mechanical activity of the heart is the actual pumping action. This involves the coordinated opening and closing of the heart valves and the contraction and relaxation of the heart muscle. The rhythmic cycle of contraction (systole) and relaxation (diastole) of the heart chambers constitutes a heartbeat.

Monitoring südameaktiivsus is crucial for diagnosing and managing various cardiovascular conditions. Electrocardiography (ECG or EKG) is a common diagnostic tool that records the electrical activity of the heart, providing valuable information about its rhythm, rate, and the presence of abnormalities. Echocardiography, which uses ultrasound, visualizes the heart's structure and function, including its mechanical pumping ability. Understanding südameaktiivsus is fundamental to comprehending heart health and disease.