The conventional model of the circulatory system assumes the heart pumps blood out of the ventricles through a series of progressively branching arteries of decreasing diameter transitioning to innumerable microscopic capillaries which then progressively converge as veins of increasing diameter connected to the atriums then back to the ventricles. Although the return trip through veins is assisted by skeletal muscle contractions squeezing blood through one-way valves, arteries lack valves and are assumed to be passive conduits.
The total length of blood vessels, if strung end to end, is said to be 60,000 miles for a human. Are there 60,000 miles of blood vessels in the human body?. Obviously the vast majority of this distance is from capillaries. So even if we assume skeletal contractions account for 100% of power for venous blood, that still leaves at least 30,000 miles of arteries and capillaries. We can further assume capillaries are multiply redundant and not actually in use simultaneously (regulated by arterial sphincters). But that still leaves thousands of miles of conduits for blood to traverse before reaching the veins.