Explain the changes in heart during one cardiac cycle. Enable Ginger Cannot connect to Ginger Check your internet connection or reload the browser Disable in this text field Rephrase Rephrase current sentence Edit in Ginger ×

Atria and ventricles show rhythmic contractions and relaxations during a specific manner during one heart beat and this is often referred to as a cycle . The sequence is: 1. Joint diastole: Both atria and ventricles are relaxed. Right atrium receives blood from vena cavae. Left atrium receives blood from pulmonary veins. Some blood flows directly into the ventricles. It lasts for 0.4 sec. 2.Atrial diastole: Atrial relax. Blood flows into the atrium. Lasts for 0.7 sec. 3. Ventricular systole: Ventricles contract. High pressure in ventricles, the blood flows from left ventricle into the aortic arch, and from right ventricle into the pulmonary arch. Bicuspid and tricuspid valves close. LUBB sound is produced. lasts for 0.3 sec. 4. Ventricular diastole: Ventricles relax. Drop in vital sign in ventricles causes semi-lunar valves within the arches to shut . Produce a soft DUB sound. lasts for 0.5 sec.