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Smart Learning for All.com | Cardiac Cycle, why does the heart make a lub dub sound?

Smart Learning for All Cardiac Cycle. Mr. Tall. Mr. Short. Help me. Please help me. Ms. Pretty. 10:00 a.m.. Mr. Boss. Yes Boss. We need to find that answer to this question. Cardiac Cycle: Why does the heart make 'lub dub' sound? The answer is inside the box. SLfA.com. Mr. Angry Professor. Answer. The lub dub sound is caused by the movement of two pairs of valves in the chambers of heart. Initially, the blood gets collected in the upper chambers of the heart which then eventually flows in the lower chambers. When the lower chambers of the heart are filled with blood, it contracts to pump the blood to various parts of the body. At this moment, the tricuspid and mitral valves close, creating a lub sound. They close to prevent the back flow of blood into the upper chambers. Once the blood is pumped, the pulmonary and aortic valves close to prevent its backflow back into the lower chambers, creating a dub sound. For more educational videos please visit http://www.SmartLearningforAll.com Also, don't forget to subscribe to our YouTube channel.