Muscle contraction in our extremities help squeeze blood back to the heart as the veins are under much lower pressure than the arteries. Additionally, the veins have one-way valves to keep blood flowing towards the heart when the vessels are squeezed by contracting skeletal muscles.
veins
arteries
The flow of blood from the heart to the lungs and back to the heart is called pulmonary circulation.
veins are responsible for bringing blood back to the heart.
Semilunar valves
it just goes back
The flow of blood from the heart to the lungs and back to the heart is called the pulmonary circulation.The blood flowing from the heart to the lungs would be deoxygenated and blood flowing towards the heart from the lungs would be oxygenated.
the heart is a double pump The heart pumps deoxigenated blood from the body through the heart and then through the lungs the back to the heart.
Valves prevent the backflow of blood, in this case the semilunar valves stop blood flowing back into the heart.
If your asking if they slow the blood down... no, they open to allow blood to flow with the beating of the heart, but close to prevent back flow/flowing away from the heart
They prevent back flow and help to return blood to the heart.
That's called the circulatory system.
The three main paths are the pulmonary path which moves from the heart to the lungs and back, the somatic path where blood flows to the tissues and back and the flow of blood to the muscle of the heart and back.
From the capillaries, blood will flow into the veins and pump the un-oxygenated blood back to the heart.