veins are large, thin-walled blood vessels that carry blood to the heart!!!!
Lymphatics resemble veins in structure but have thinner walls and more valves.
Valves
compare and contrast the structure of a vein and artery
The coronary veins drain into the coronary sinus, which in turn drains into the right atrium.
Arteries carry blood away from the heart, veins carry blood to the heart, and capillaries branch off of arteries and veins. Capillaries are essentially min-arteries and min-veins.
Valves
yes
The Xylem.
It comes back through the pulmonary veins. Veins always carry blood TO the heart. This is the only case where veins are high in oxygen.
The oxygen saturation is highest in the pulmonary veins. These veins carry oxygenated blood from the lungs back to the heart to be pumped to the rest of the body.
Placenta containng arteriesd and veins .
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.