yes.it prevent the intermixing of oxygenated and deoxygenated blood
Yes most veins have one-way valves
No, but some have one way valves in them.
These are valves, and are found in veins to prevent blood from flowing backwards.
veins contain valves that prevents blood flowing backwards between heartbeats.There are valves in the veins that stop the blood from flowing backwards.
Valves.
Veins have valves to make sure that blood flows in only one direction.
Other way around. Valves appear in veins to keep the blood flowing in one direction to the heart.
Veins have valves which stop the blood from flowing backwards
valves in the veins
Heart valves help prevent blood from flowing backwards through the chambers of the heart. They open only one way to allow blood to flow through to the next chamber, and close against flow of blood from the other directon.
Valves in the veins prevent the blood from flowing backward or from pooling.
Many have small valves that keep the blood flowing in the correct direction. You can actually see these if they fail to work. We call them varicose veins.
Valves, allown blood through in one direction when the pressure builds up but close when pressure is applied in the opposite direction.
The blood in veins is not under direct pressure from the heart. It has little valves inside to prevent blood from flowing backwards away from the heart. These valves inside the veins prevent the backflow of blood in veins. They encourage the one-directional flow of blood to the heart.