answersLogoWhite

0

It contracts, so the blood flows into the arteries. Then, the cardiac muscle relaxes, so the blood flows back. The backflowing blood fills the valves in the arteries, so it cannot flow back into the heart itself. While the cardiac muscle relaxes, new blood flows into the ventricles and atriums from other veins.

User Avatar

Wiki User

15y ago

What else can I help you with?