Question
What are precaval veins?
Answer :
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Precaval veins are major veins in vertebrates that carry deoxygenated blood from the anterior parts of the body, including the head, neck, and forelimbs, back to the heart. These veins drain blood into the right atrium through the precaval system, which is situated anterior to the heart. The term "precaval" specifically refers to the veins located in front of (pre-) the heart's main venous inflow region. In the comparative anatomy of vertebrates, the precaval veins show variation depending on the complexity and evolutionary adaptations of the circulatory system. In fish and lower vertebrates, the venous system is relatively simple, with paired anterior cardinal veins serving the function of precaval veins. These veins collect blood from the head and anterior body regions and channel it
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