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प्रश्न
Long answer question:
How blood is kept moving in the large veins of the legs?
उत्तर
1. The blood in the large veins of legs is kept moving by the means of azygos system (located on either side of the vertebral column and drains the viscera within the mediastinum, as well as the back and thoracoabdominal walls).
2. It serves as a bypass for the inferior vena cava that drains blood from the lower body.
3. Several small veins link the azygos system directly with inferior vena cava. Large veins drain the lower limbs and abdomen, conducts blood into the azygos system.
4. If the inferior vena cava or hepatic portal vein becomes obstructed, the azygos system returns blood from the lower body to the superior vena cava.
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