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.
veins are blood vessels
Veins
veins, maybe
in the veins
veins
veins from the body or the pulmonary veins from the lungs
The veins carry blood toward the capillaries.
Veins
blood vessels that carry blood toward the heart are called veins.
Veins.
Veins
The blood vessel that has a pulse is an artery. Veins do not have enough blood pressure to register a pulse.