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	{{Cardiovascular system physiology}}		{{Cardiovascular system physiology}}
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			<gallery>
			File:Heart_systole.svg\|Heart during systole
			File:QRS_normal.svg\|Normal QRS complex
			File:Heart_diasystole.svg\|Heart during diastole
			File:Wiggers_Diagram.svg\|Wiggers diagram
			</gallery>

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2024-02-25T05:02:35Z

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'''Systole''' is the part of the [[cardiac cycle]] during which the [[heart]] contracts and pumps [[blood]] from the chambers into the arteries. This term is usually used in reference to the action of the [[ventricles]].

== Overview ==
The process of systole involves the contraction of the heart muscles, specifically the ventricles, to pump blood into the body's circulatory system. This is in contrast to [[diastole]], the phase of the cardiac cycle during which the heart relaxes and fills with blood.

== Phases of Systole ==
Systole is divided into two phases: [[isovolumetric contraction]] and [[ventricular ejection]].

=== Isovolumetric Contraction ===
During isovolumetric contraction, the ventricles begin to contract with the closure of the [[mitral valve]] and [[tricuspid valve]], which prevents backflow of blood into the [[atria]]. However, the [[aortic valve]] and [[pulmonary valve]] are also closed, so the blood volume in the ventricles remains constant.

=== Ventricular Ejection ===
In the ventricular ejection phase, the aortic and pulmonary valves open due to the increased pressure in the ventricles. Blood is then ejected from the ventricles into the [[aorta]] and [[pulmonary artery]].

== Measurement ==
The duration of systole can be measured using an [[electrocardiogram]] (ECG), which records the electrical activity of the heart. The [[QRS complex]] on an ECG corresponds to the depolarization of the ventricles, which initiates systole.

== Clinical Significance ==
Abnormalities in systole can lead to various heart conditions. For example, [[systolic heart failure]] occurs when the heart is unable to pump blood effectively during systole. [[Systolic hypertension]] refers to high blood pressure during systole.

== See Also ==
* [[Diastole]]
* [[Cardiac cycle]]
* [[Heart]]
* [[Blood pressure]]

[[Category:Cardiology]]
[[Category:Cardiac physiology]]
[[Category:Medical terminology]]

{{Cardiac cycle}}
{{Cardiovascular system physiology}}
{{stub}}

Systole - Revision history

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