Answer:
The way blood moves back into the heart even when the blood pressure is low in the veins is both through the SVC (Superior vena cava) and the IVC (inferior vena cava). These are the two central veins that bring blood back to the heart.
Along with this during low blood pressure situations there are the;
Compression: The veins' walls are elastic and designed to contract, which helps blood move forward toward the heart.
One-way Valves: There are valves in the veins that allow blood to move forwards and prevent it from moving backward.
Capillaries: The capillaries are very tiny blood vessels that allow the exchange of fluids, gases, and other substances between the blood and the cells of the body.