if a heartbeat pushes blood to an organ with that beat’s force, then after it reaches capillaries, how would the deoxygenated blood return to the heart? With the momentum reduced at capillaries or organs, which force drives the blood back to the heart?

Question

if a heartbeat pushes blood to an organ with that beat’s force, then after it reaches capillaries, how would the deoxygenated blood return to the heart? With the momentum reduced at capillaries or organs, which force drives the blood back to the heart?

In: Biology

Answer 1

The larger veins, particularly in the legs, also have one-way valves in them that prevent backflow. So in a healthy system, the veins only flow back to the heart.

Incidentally, spider and varicose veins are caused by failures in those valves which allows blood to pool in those areas.