What is the Meaning & Definition of xylem

It is called the xylem to the set of woody vessels in plants through which passes the raw SAP. I.e., xylem, is a fabric of conductive type which deals especially the transportation of raw materials absorbed by the root of a plant, to producing organs that are the leaves. As a result, transport turns out to be upward, rises from the root to the leaves.
The power to carry out the above-mentioned transport occurs by two physical phenomena: osmosis (move up the water accumulated at the root by the difference between the soluble potential corresponding to the root tissue and soil moisture) and suction (attracts towards the leaves the water contained in the vascular tissue with a mission to offset the loss of water that exist by transpiration from the leaves).
Although, the above is not the only task which the xylem is responsible since it also participates in the conduct of minerals, the reserve of nutrients and support.
With respect to its conformation is a woven complex consisting of several types of cells such as: conductive elements (involved in transportation), the tracheids and vessels xilemáticos. The above cells come from a lateral meristem.
On the other hand, the vessel xilemáticos are composed of cells arranged in columns and that reabsorb common walls. At maturity they stay dead, whereby the cellular content disappears in such way the xylem vessel will be a hollow tube. This type of cell will present secondary wall in cases where vessels are mature, in other organs, the secondary wall will be incomplete.
On the other hand, the tracheids, are conducting cells that appear in Angiosperms and Gymnosperms. Its shape is elongated finished in tip with fusiform shape and secondary wall. Its diameter is less than of the xylem vessel and fibers not re-absorbed common walls, on the other hand, will be communicated through pits. Why is that its transport capacity will be less than the xilemáticos vessels.
Article contributed by the team of collaborators.

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