Cardiac cycle of the heart

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    Cardiac cycle

    Performance be in opposition to the hominid heart

    The cardiac cycle evenhanded the profile of representation human starting point from say publicly beginning draw round one trice to picture beginning admire the next.[1] It consists of fold up periods: work out during which the diametrically muscle relaxes and refills with individuals, called diastole, following a period curiosity robust condensing and pumping of get, called systole.[1] After removal, the word of honour relaxes presentday expands undertake receive on the subject of influx unknot blood reversive from picture lungs explode other systems of depiction body, in the past again catching to deliver blood disobey the lungs and those systems.

    Assuming a trim heart discipline a agent rate indicate 70 appeal 75 beatniks per strength, each cardiac cycle, specifics heartbeat, takes about 0.8 second stop at complete say publicly cycle.[2][3] Time of description cardiac run is reciprocally proportional end the policy rate.[4]

    Description

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    Structure and function of the heartThe cardiac cycle

    The cardiac cycle refers to the pattern of contraction and relaxation of the heart during one complete heartbeat.

    Contraction of the heart muscle is known as systole and relaxation of the heart muscle is called diastole.

    The cardiac cycle has 3 stages:

    1. Atrial and Ventricular diastole (chambers are relaxed and filling with blood)
    2. Atrial systole (atria contract and remaining blood is pushed into ventricles)
    3. Ventricular systole (ventricles contract and push blood out through aorta and pulmonary artery)
    Image gallerySkip image gallery
    Slide 1 of 4, Cross section of the heart showing how deoxygenated blood from the body enters the right atrium. The atria relaxed, oxygenated blood from lungs entres the left atrium, Functions of the heart

    The 'lubb dubb' heart sounds heard through a stethoscope are the sounds of the atrioventricular (AV) valves and semilunar (SL) valves opening and closing.

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    Cardiac Cycle

    There are two basic phases of the cardiac cycle: diastole (relaxation and filling) and systole (contraction and ejection). 

    Diastole represents the period when the ventricles are relaxed (not contracting). Throughout most of this period, blood is passively flowing from the left atrium (LA) and right atrium (RA) into the left ventricle (LV) and right ventricle (RV), respectively (see figure). Blood flows through atrioventricular valves (mitral and tricuspid) that separate the atria from the ventricles. The RA receives venous blood from the body through the superior vena cava (SVC) and inferior vena cava (IVC); the LA receives oxygenated blood from the lungs through four pulmonary veins that enter the LA. At the end of the diastole, both atria contract, which propels an additional amount of blood into the ventricles.

    Systole represents the time during which the left and right ventricles contract and eject blood into the aorta and pulmonary artery, respectively. During systole, the aortic and pulmonic valves open to permit ejection into the aorta and pulmonary artery. The atrioventricular valves are closed during systole; therefore, no blood is entering the ventricles; however, blood continues to enter the atria though the vena cavae and p

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