Cardiac cycle
Cardiac Cycle
The Cardiac Cycle (pronounced: /ˈkɑːrdiæk ˈsaɪkəl/) is a term used in medicine to describe the sequence of events that occur when the heart beats. It is a complex process that involves the coordinated contraction and relaxation of the heart's chambers to pump blood throughout the body.
Etymology
The term "Cardiac Cycle" is derived from the Greek words "kardia" meaning heart, and "kyklos" meaning circle or cycle. This reflects the cyclical nature of the process.
Phases of the Cardiac Cycle
The Cardiac Cycle is divided into two main phases: Diastole and Systole.
1. Diastole (pronounced: /daɪˈæstəliː/): This is the phase of the cardiac cycle during which the heart relaxes and fills with blood. It is further divided into early diastole, when the ventricles are filling, and late diastole, when the atria contract to complete ventricular filling.
2. Systole (pronounced: /ˈsɪstəliː/): This is the phase of the cardiac cycle during which the ventricles contract and pump blood out of the heart. It is further divided into early systole, when the ventricles begin contracting, and late systole, when the ventricles finish contracting and begin to relax.
Related Terms
- Electrocardiogram: A test that measures the electrical activity of the heart and can be used to assess the timing and duration of the cardiac cycle.
- Heart Rate: The number of cardiac cycles that occur in one minute.
- Stroke Volume: The amount of blood pumped by the heart during each cardiac cycle.
See Also
External links
- Medical encyclopedia article on Cardiac cycle
- Wikipedia's article - Cardiac cycle
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