What does "Primary vein" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
A primary vein is a major blood vessel in the body that carries blood from different parts of the body back to the heart. These veins are larger and more important than other smaller veins because they transport a larger volume of blood. They are like the main highways in the body's circulatory system, while smaller veins are like side streets. The primary veins include the superior and inferior vena cava, the pulmonary veins, and others.
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