Systole

Systole is a contraction of the heart muscle that occurs as a result of excitation. During systole, blood is pushed from the heart into the arteries and delivered to the organs and tissues of the body.

Systole begins with an isovolumic contraction phase, when the heart muscle contracts without changing the volume of the heart cavity. This is followed by an isometric contraction phase, when the heart contracts but its volume remains unchanged. At the end of systole, the ejection phase occurs when blood is pushed into the arteries.

The process of systole is regulated by the nervous system. When the heart receives a signal from the nervous system, it begins to contract. This signal can be caused by various factors such as exercise, stress or hormonal changes.

It is important to note that systole is one of the key processes in the work of the heart. Impaired systole can lead to various heart diseases such as heart failure or arrhythmia. Therefore, it is necessary to monitor your health and undergo regular medical examinations.

Systole is the period of the cardiac cycle during which the heart contracts and blood is pushed from the ventricles into the arteries. It is at this time that the body receives the necessary amount of oxygen and nutrients, and also gets rid of carbon dioxide and metabolic products.

The heart beats about 70 beats per minute. Systole lasts from 0.1 to 0.3 seconds. During this time, the heart compresses the myocardium and “locks” the valves that hold blood inside the ventricle. The heart muscle then relaxes and blood is squeezed into the open arteries.

The beating of the heart is due to the neurohumoral regulation of heart rhythm. This process is primarily influenced by the autonomic nervous system. Parasympathetic nerves slow down and weaken systole, increasing peripheral blood circulation. If autonomic regulation is disrupted, this leads to arrhythmia and various cardiac pathologies.