What Is The Process Of Cardiac Cycle: A Comprehensive Guide

What Is The Process Of Cardiac Cycle: A Comprehensive Guide

The Cardiac Cycle, Animation

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What Are The 4 Stages Of Cardiac Cycle?

The cardiac cycle consists of four distinct phases, each playing a crucial role in the functioning of the heart’s ventricles. These stages are as follows:

  1. Isovolumic Relaxation: This phase marks the beginning of the cardiac cycle. It starts immediately after the ventricles have contracted to pump blood into the aorta and pulmonary artery. At this point, the aortic valve has just closed, preventing backflow into the heart, while the mitral valve remains closed. This brief moment allows the ventricles to relax and prepare for the next phase.

  2. Ventricular Filling: Following isovolumic relaxation, the ventricles enter the ventricular filling phase. During this stage, the mitral valve opens, allowing blood from the atria to flow into the ventricles. This filling process ensures an adequate supply of blood for the next contraction.

  3. Isovolumic Contraction: Once the ventricles have filled with blood, they contract forcefully to eject blood into the aorta and pulmonary artery. The isovolumic contraction phase refers to the period when both the mitral and aortic valves are closed, preventing any blood flow into or out of the ventricles while they build up pressure.

  4. Rapid Ventricular Ejection: In the final stage of the cardiac cycle, the aortic valve opens as the ventricular pressure surpasses the pressure in the aorta. This allows blood to be rapidly ejected from the ventricles into the aorta, providing the body with the necessary oxygen and nutrients.

Understanding these four stages of the cardiac cycle is essential for comprehending the intricate coordination of the heart’s actions as it continually pumps blood throughout the body.

What Is Step 5 Of The Cardiac Cycle?

Certainly, let’s provide a more comprehensive explanation of step 5 in the cardiac cycle to help readers better understand the topic:

Step 5 of the cardiac cycle is the ventricular diastole phase, which is a crucial stage in the continuous process of the heart’s pumping action. During this phase, the ventricles of the heart, specifically the left and right ventricles, undergo relaxation and expansion. This relaxation allows the ventricles to fill with blood coming from the atria. In the preceding step, step 4 (atrial systole), the atria contracted, pushing blood into the ventricles. Step 5 follows immediately after, and it serves to prepare the heart for the next contraction phase (step 6), which is ventricular systole.

During ventricular diastole, the pressure inside the ventricles decreases, creating a pressure gradient that allows blood to flow from the atria into the ventricles. This passive filling of the ventricles accounts for approximately 70-80% of the blood that eventually gets ejected from the heart during the next contraction. It’s important to note that the heart’s valves, specifically the atrioventricular (AV) valves (tricuspid and bicuspid valves), play a critical role in preventing backflow of blood into the atria during this phase. Once the ventricles are adequately filled, they are primed for the upcoming contraction, which will propel blood into the pulmonary and systemic circulation to supply oxygen and nutrients to the body’s tissues and organs. This intricate sequence of events in the cardiac cycle ensures the efficient and continuous circulation of blood throughout the body.

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Cardiac Cycle - Wikipedia
Cardiac Cycle – Wikipedia
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Cardiac Cycle- Physiology, Diagram, Phases Of The Cardiac Cycle
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Cardiac Cycle – Definition, Phases, Diagram, Faqs – Geeksforgeeks
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Cardiac Cycle: Definition, Phases, And Heart Sounds
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Artstation – Phases Of The Cardiac Cycle
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Cardiac Cycle Explained: Cardiac Cycle Phases, Ecg, Graph

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The Cardiac Cycle, Animation
The Cardiac Cycle, Animation

The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole.The ventricular function can be divided into four phases: isovolumic relaxation, ventricular filling, isovolumic contraction, and rapid ventricular ejection. Isovolumic relaxation is the period immediately after ventricular contraction when the aortic valve has closed, but the mitral valve has not yet opened.Cardiac Cycle – Isovolumetric Relaxation (Phase 5)

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