Distinguishing Between Arterial and Venous Disease

In [1], author has mentioned the difference between arteries and veins. They are as follows. Blood vessels of retina are divided into two types. They are 1. Arteries. 2. Veins. Arteries transport blood rich in oxygen to the organs of the body. The veins transport blood low in oxygen level. Arteries are brighter but Veins are darker. ................
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