Presystole (Presystole)

Presystole is the part of the cardiac cycle that immediately precedes systole and is characterized by a decrease in cardiac muscle tone and a drop in blood pressure. It lasts about 0.1 seconds and is an important stage in the work of the heart, as it ensures that the ventricles are filled with blood before the onset of systole.

During presystole, the heart is at rest and does not contract, but blood pressure continues to fall. This occurs because the ventricles of the heart fill with blood from the atria, which in turn received blood from the capillaries. After presystole, systole begins, which is characterized by contraction of the ventricles and ejection of blood into the arteries.

Presystole is an important stage of the cardiac cycle and plays a key role in ensuring normal heart function. It allows the ventricles to prepare for the onset of systole and provides a sufficient amount of blood to maintain normal circulation.

Presystole: Description and role in the cardiac cycle

The cardiac cycle, a complex process that ensures continuous circulation of blood throughout the body, consists of several phases. One of the key phases is presystole, also known as presystole. In this article we will look at presystole, its description and role in the cardiac cycle.

Description of presystole:

Presystole is the time interval that immediately precedes systole. Systole is the contraction phase of the heart muscle, which results in the ejection of blood from the heart into the arterial system. Presystole performs the important function of preparing the heart for the next systole and ensures efficient functioning of the heart muscle.

During presystole, the heart goes through several changes. First, diastole occurs, during which the heart relaxes and fills with blood. This is followed by the presystolic period, when the heart muscle begins to contract, but has not yet reached full systole. At this moment, the atria contract, which leads to further filling of the ventricles with blood.

The role of presystole in the cardiac cycle:

Presystole plays an important role in ensuring the efficient functioning of the heart. First, it allows the atria to contract fully and pump the remaining blood into the ventricles. This ensures optimal ventricular filling before the next systole and maximizes blood ejection from the heart.

In addition, presystole affects heart rate and regulation of cardiac activity. Normal heart rhythm is controlled by a special electrical system that generates impulses and coordinates the heart's contractions. Presystole serves as a time interval for the occurrence of an electrical impulse, which triggers the next systole. This helps maintain a stable heart rhythm and ensures its proper functioning.

In conclusion, presystole is an integral part of the cardiac cycle. This time interval before systole ensures optimal filling of the ventricles with blood and maintains the stability of the heart rhythm. Understanding the role and function of the presystole allows us to better understand the complex mechanism of the heart and the importance of its proper function to overall health and well-being.

Presystole is the part of the cardiac cycle that immediately precedes systole and is the period when the heart begins to relax and prepare for the next contraction. This is a very important stage in the work of the heart, as it prepares it for the next systolic phase, during which the heart muscle contracts and blood is released from the heart into the vessels.

Presystole begins with the diastole phase, when the heart muscle is completely relaxed and ready to contract. Then the presystole phase begins, which lasts from 0.1 to 0.2 seconds. During this period, the heart begins to contract, but not completely, but only by 1/4 or 1/5. This allows the heart to prepare to contract fully and release blood into the vessels. During presystole, the heart is also filled with blood from the veins.

The importance of presystole is that it allows the heart to prepare for the next contraction and ensures normal blood flow. If presystole is impaired, this can lead to various heart diseases, such as arrhythmia, coronary heart disease and others. Therefore, it is important to monitor your health and undergo regular examinations with a doctor.