What comprises leaf veins?

Leaf veins are primarily composed of vascular tissue, which includes xylem and phloem. Xylem transports water and minerals from the roots to the leaves, while phloem distributes the sugars produced during photosynthesis throughout the plant. The veins are supported by a network of parenchyma cells and are often surrounded by bundle sheath cells that help regulate the flow of materials. Together, these components provide structural support and facilitate the movement of nutrients and water within the leaf.