Ventricular systole
Ventricular Systole
Ventricular systole (pronounced: ven-TRIK-yoo-lar SIS-toh-lee) is a critical phase in the cardiac cycle that involves the contraction of the ventricles in the heart. This process is responsible for pumping blood to the body's various organs and tissues.
Etymology
The term "ventricular systole" is derived from two words. "Ventricular" comes from the Latin word "ventriculus," which means "little belly," referring to the lower chambers of the heart. "Systole" is derived from the Greek word "systole," meaning "a drawing together or a contraction."
Process
During ventricular systole, the ventricles contract, causing the tricuspid valve and mitral valve (also known as the atrioventricular valves) to close. This prevents blood from flowing back into the atria. The pressure within the ventricles increases, forcing the pulmonary valve and aortic valve (the semilunar valves) to open. This allows blood to be pumped out of the heart and into the pulmonary artery and aorta, respectively.
Related Terms
- Cardiac cycle: The complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next.
- Diastole: The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
- Atria: The two upper chambers of the heart.
- Ventricles: The two lower chambers of the heart.
- Tricuspid valve: The valve between the right atrium and the right ventricle of the heart.
- Mitral valve: The valve between the left atrium and the left ventricle of the heart.
- Pulmonary valve: The valve controlling blood flow from the right ventricle into the pulmonary arteries.
- Aortic valve: The valve controlling blood flow from the left ventricle into the aorta.
External links
- Medical encyclopedia article on Ventricular systole
- Wikipedia's article - Ventricular systole
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