How blood is helped in its return back to the heart What are two systems?

Blood is aided in its return to the heart primarily by the venous system and the muscular system. The venous system, equipped with one-way valves, prevents backflow and ensures that blood moves toward the heart. Additionally, the muscular system plays a critical role through skeletal muscle contractions that compress veins, pushing blood upwards. The respiratory system also assists by creating pressure changes in the thoracic cavity during breathing, which helps draw blood back to the heart.