Pulmonary Embolism. What’s That?

The circulatory system carries blood throughout the body via an intricate network of arteries and veins.  The venous system is the section of the circulatory system that uses veins to return the used, or deoxygenated, blood to the heart and lungs.  Occasionally, irregularities in the wall of a vein (especially in areas of slow flow, such as the area surrounding a venous valve) can cause a blood clot, or thrombus, to form. Once formed, additional fibrin and red blood cell deposits cause the thrombus to grow inside the vein.

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