In the cardiac cycle, blood flowing into the heart is called the systole.
There are valves in the heart - and the larger blood vessels that stop the blood flowing backwards.
The valve
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.
Valves prevent the backflow of blood, in this case the semilunar valves stop blood flowing back into the heart.
There are two ways that blood is kept flowing in the same direction. The heart is pumping it in that direction, and blood vessels contain valves which prevent blood from flowing in the wrong direction.
There are valves in the heart - and the larger blood vessels that stop the blood flowing backwards.
The valve
All the blood flowing through the intestines passes through the liver on its way back to the heart.
The valve
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.
Valves
valves keep blood from flowing back into the heart and help pump oxygen-poor blood back to the heart.
Blood coming out of the capillaries passes into vessels of increasing diameter as it flows back toward the heart. It is usually deoxygenated.
Valves prevent the backflow of blood, in this case the semilunar valves stop blood flowing back into the heart.
The mitral valve prevents blood from flowing back from the left ventricle to the left atrium in the heart.
The veins carries the blood back to the heart using the circulatory system. It then stores the blood in the arteries and the heart pumps it back around the body.
veins and back to the heart.