Why do we call the vascular bundles in plant leaves "veins"? I think its probably because the xylem and pholem serve circulatory function analogous to the human body's circulatory system with arteries and veins. But why don't we call the vascular bundles arteries instead or veins?
In the human body, we call a blood vessel "vein" when it travels blood to the heart and an "artery" when a blood vessel travels blood away from the heart. Is there a similar reason or significance as to why we call vascular bundles "veins" instead of "arteries"?