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  2. Heart valve - Wikipedia

    en.wikipedia.org/wiki/Heart_valve

    These valves do not have chordae tendineae, and are more similar to the valves in veins than they are to the atrioventricular valves. The closure of the semilunar valves causes the second heart sound. The aortic valve, which has three cusps, lies between the left ventricle and the aorta.

  3. Wiggers diagram - Wikipedia

    en.wikipedia.org/wiki/Wiggers_diagram

    Semilunar valves: Atrioventricular valves: A: Atrial systole: P: S4* closed: open B: ... all the heart valves are closed; at no time are all the heart valves open. [1] *

  4. Anatomy of the human heart - Wikipedia

    en.wikipedia.org/wiki/Anatomy_of_the_human_heart

    There are four major valves in the heart, two atrioventricular valves (connecting one atrium to a ventricle) and two arterial (or semilunar) valves guarding the outflow of blood from the human heart. Each atrioventricular valve (tricuspid and mitral valves) consists of the leaflets, the annulus, the tendinous cords, the papillary muscles, and ...

  5. Tricuspid valve - Wikipedia

    en.wikipedia.org/wiki/Tricuspid_valve

    The tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, at the superior portion of the right ventricle.The function of the valve is to allow blood to flow from the right atrium to the right ventricle during diastole, and to close to prevent backflow (regurgitation) from the right ventricle into the right atrium during right ventricular ...

  6. Isovolumetric contraction - Wikipedia

    en.wikipedia.org/wiki/Isovolumetric_contraction

    As diastole ends, the ventricles begin depolarizing and, while ventricular pressure starts to rise owing to contraction, the atrioventricular valves close in order to prevent backflow to the atria. At this stage, which corresponds to the R peak or the QRS complex seen on an ECG, the semilunar valves (aortic and pulmonary valves) are also closed.

  7. Cardiac physiology - Wikipedia

    en.wikipedia.org/wiki/Cardiac_physiology

    The semilunar valves close to prevent backflow into the heart. Since the atrioventricular valves remain closed at this point, there is no change in the volume of blood in the ventricle, so the early phase of ventricular diastole is called the isovolumic ventricular relaxation phase, also called isovolumetric ventricular relaxation phase. [1]

  8. List of cardiology mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_cardiology_mnemonics

    Digoxin: Helps slow the heart rate by blocking the number of electrical impulses that pass through the AV node into the lower heart chambers (ventricles). E lectrocardioversion: A procedure in which electric currents are used to reset the heart's rhythm back to regular pattern.

  9. Aortic valve - Wikipedia

    en.wikipedia.org/wiki/Aortic_valve

    In the congenital disease known as transposition of the great arteries, these two valves are reversed (the anterior valve is the aortic valve) and the origin of the coronaries still follows this "rule" that the origins are in the sinuses facing the pulmonary valve. The term "semilunar" refers to an approximate half-moon shape of the valve leaflets.