veins have valves in them that prevent backflow
force/gravity
Valves in the veins prevent the blood from flowing backward or from pooling.
Pulmonary artery which contains pulmonic valve and aorta which contains aortic valve.
The four heart valves.
Valves are primarily found in veins. They are important because when blood is returning to the heart from places like the feet, they are moving against gravity. In order to prevent the blood from falling down to the feet as it rises back to the heart, valves are in place in order to prevent the blood from flowing backward.
Only veins contain valves. The valves prevent the backward flow of blood.
Valves. Mitral and aortic.
Veins have valves to make sure that blood flows in only one direction.
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.
a flap of tissue that prevants blood from flowing backward is
Your heart keeps your blood "flowing"
valves in the veins
heart valves