What is cardiac cycle?explain?

Question

Answer

The period of time that begins with contraction of the atria and ends with ventricular relaxation is known as the cardiac cycle. The period of contraction that the heart undergoes while it pumps blood into circulation is called systole. The period of relaxation that occurs as the chambers fill with blood is called diastole. Both the atria and ventricles undergo systole and diastole, and it is essential that these components be carefully regulated and coordinated to ensure blood is pumped efficiently to the body.

Answer

The cardiac cycle is the sequence of events that occurs when the heartbeats. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle. In the diastole phase, the heart ventricles are relaxed and the heart fills with blood. In the systole phase, the ventricles contract and pump blood out of the heart and to arteries. One cardiac cycle is completed when the heart chambers fill with blood and blood is then pumped out of the heart!!!

Answer

The cardiac cycle refers to the sequence of events that occur during one complete heartbeat. The cycle consists of a period of relaxation, called diastole, followed by a period of contraction, called systole. The cardiac cycle is controlled by the electrical impulses generated by the heart's pacemaker, the sinoatrial (SA) node, and is vital for the circulation of blood throughout the body.

Phases of the Cardiac Cycle:

1. Atrial Systole: During this phase, the atria contract and push blood into the ventricles.

2. Isovolumic Contraction: In this phase, the ventricles begin to contract, but the valves remain closed, so there is no change in volume.

3. Ventricular Ejection: During this phase, the ventricles contract fully, and the blood is pushed out of the heart into the arteries.

4. Isovolumic Relaxation: In this phase, the ventricles relax, but the valves remain closed, so there is no change in volume.

5. Atrial Relaxation: During this phase, the atria continue to relax, and blood flows into them from the veins.

Regulation of the Cardiac Cycle:

The cardiac cycle is regulated by a complex interplay of electrical signals and hormones, including the sympathetic and parasympathetic nervous systems, and hormones such as adrenaline and noradrenaline.

Disorders of the Cardiac Cycle:

Disorders of the cardiac cycle can have serious consequences, including heart failure, arrhythmias, and myocardial infarction (heart attack). Treatment may involve medications, lifestyle changes, or, in severe cases, surgery.

Conclusion:

The cardiac cycle is a complex sequence of events that is vital for the proper functioning of the heart and circulation of blood throughout the body. Understanding the phases of the cardiac cycle, as well as the factors that regulate it, is crucial for the diagnosis and treatment of disorders affecting the heart.

Answer

One systole and diastole is called cardiac cycle...

Answer

Answer

Medical Definition of cardiac cycle

: the complete sequence of events in the heart from the beginning of one beat to the beginning of the following beat : a complete heartbeat including systole and diastole.

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