![]() ![]() The freshly oxygenated blood in the lungs flows through the pulmonary vein and into the left atrium. Now it just has to get to all those billions of cells. The blood goes from poorly oxygenated to freshly oxygenated, and is now ready to supply the cells of the body with fresh oxygen all over again. In the lungs the blood rids itself of carbon dioxide and absorbs a fresh supply of oxygen during exhalation and inhalation. When the right ventricle is filled adequately (again, this takes only a few milliseconds), it contracts and the blood flows through another valve called the pulmonic valve, into the pulmonary artery, and eventually into the lungs. The blood that is now in the right ventricle rapidly mixes with the small amount of residual blood that remains in the right ventricle from its last contraction. A murmur is detected with a stethoscope when ausculting the chest. A heart murmur, which is explained later, is a turbulence of blood flowing through one of the heart valves (there are 4 of them), like the tricuspid valve. In a healthy heart blood can flow only from the atrium into the ventricle. The tricuspid valve, like the other valves in the heart, is a one-way valve. When an adequate amount of blood has filled the right atrium (this takes only milliseconds) it contracts, and blood flows through the tricuspid valve (also called the right atrio-ventricular (A-V) valve) and into the right ventricle. From the back end of the body it flows through the posterior vena cava (PVC) and into the right atrium. From the head, it flows through the anterior vena cava (AVC) into the right atrium. ![]() They are kept simple on purpose so that you can understand the sometimes complicated concepts we will be explaining.īlood that has supplied the cells with oxygen, and now contains carbon dioxide to be eliminated from the body when we exhale, flows into the heart from 2 directions. It might be a good idea to come back to these diagrams when we go into more detail later. It will also help in understanding the anatomy later in this page when we show you actual anatomic structures of the dogs heart. This will dramatically help in your understanding of the flow of blood. We will be using some basic diagrams to explain the flow of blood through the 4 chambers of the mammalian heart. Schematic of Blood Flow Through the Heart Diagram of Blood Flow Through the Heart. ![]()
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