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Oct 30, 2023 · The cardiac cycle is defined as a sequence of alternating contraction and relaxation of the atria and ventricles in order to pump blood throughout the body. It starts at the beginning of one heartbeat and ends at the beginning of another.
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- Cardiac Cycle Explained
- Cardiac Cycle Phases
- The Cardiac Cycle Video
The cardiac cycle varies in different organisms, due to changes in the structure of the heart. Fish have a two-chambered heart, with unidirectional flow.Some organisms have a three-chambered heart, which consists of the sinus venosus, atrium, and ventricle. This is seen in organisms such as reptiles and amphibians. Mammals and birds have developed ...
The two main phases of the cardiac cycle are systole and diastole, and they follow each other in sequence. Each stage in the cardiac cycle contains important stepswhich direct the flow of blood properly. These steps include contractions of heart chambers and the proper opening and closing of specific heart valves.
The entire cardiac cycle can be seen in the following animation, which tracts the cardiac cycle along with the pressure and volume of different chambers. An import tool to measure the cardiac cycle is the electrocardiogram, which can be seen as the green line on the above graph. The electrocardiogram is a signal which can be measured by sensitive m...
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- Atrial Systole. This phase is also known as presystole or the last rapid filling phage or atrial kick and is the phase when the atria contract to pump the blood out of the atria into the ventricles.
- Ventricular Systole. It is the stage when the ventricle contracts expelling the blood outside of the ventricles. The Purkinje fibers relay the cardiac impulses all over the ventricular wall stimulating the ventricular wall to contract.
- Protodiastole. It is the intermediary stage which indicates the end of systole and the beginning of the diastole stage. The ventricular ejection will have completely reduced the ventricular pressure making it lower than the blood pressure inside the major arteries.
- Atrial Diastole. It is the stage when the atria are filled. During this stage, the AV valves are closed and the superior and the inferior vena cava pours in the deoxygenated blood collected from the body tissue to the right atrium; whereas the pulmonary veins bring the re-oxygenated (purified) blood to the left atrium.
Oct 3, 2022 · Pathophysiology. One of the most clinically relevant examples of altering the normal cardiac cycle is heart failure. Heart failure represents a decreased functioning of the ventricles. This pathology can be classified as right ventricular, left ventricular, or both, as well as diastolic or systolic.
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- 2022/10/03
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Aug 23, 2023 · The cardiac cycle is the series of events that take place in one heart beat, including muscle contraction and relaxation. The contraction of the heart is called systole, while the relaxation of the heart is called diastole. One cardiac cycle is followed by another in a continuous process. There is no gap between cycles where blood stops flowing.
Feb 23, 2023 · The cardiac cycle refers to a single complete heartbeat, which includes one iteration of the lub and dub sounds heard through a stethoscope. During the cardiac cycle, the atria and ventricles work in a coordinated fashion so that blood is pumped efficiently through and out of the heart.
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Jun 29, 2023 · The cardiac cycle is the series of events that take place in one heart beat, including muscle contraction and relaxation. The contraction of the heart is called systole, while the relaxation of the heart is called diastole. One cardiac cycle is followed by another in a continuous process.
