Szívösszehúzódást

Szívösszehúzódást refers to the process of cardiac contraction, a fundamental aspect of the cardiovascular system's function. This contraction is an involuntary muscular action that propels blood throughout the body. The heart, a muscular organ, is divided into four chambers: two atria and two ventricles. The cardiac cycle, which includes both contraction and relaxation, is meticulously coordinated to ensure efficient blood circulation.

The process begins with the electrical impulse generated by the sinoatrial (SA) node, often called the heart's natural pacemaker. This impulse travels through the atria, causing them to contract and push blood into the ventricles. Subsequently, the impulse reaches the atrioventricular (AV) node, which delays it slightly before transmitting it to the ventricles. The ventricles then contract powerfully, ejecting blood into the pulmonary artery (from the right ventricle to the lungs) and the aorta (from the left ventricle to the rest of the body).

The coordinated contraction and relaxation of the heart chambers are crucial for maintaining adequate blood pressure and oxygen supply to all tissues. Any disruption in this intricate electrical and mechanical process can lead to various cardiac conditions, affecting the heart's ability to pump blood effectively. Understanding the mechanics of szívösszehúzódást is vital in diagnosing and treating cardiovascular diseases.