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Respiratory Pump mechanism- pressure changes occur in the thoracic and abdominal cavities during inspiration and expiration. This compresses veins and assists blood return to the heart.The muscle pump mechanism- muscular contractions compress the veins, squeezing blood back towards the heart. Pocket valves inside the veins prevent the back-flow of blood returning to the heart.

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Q: What are the three mechanisms that assist in venous return?
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