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The cell is the structural unit because it is a functional body systems and there is no other structure capable of fulfilling the functions of cell division that gives rise to tissues.

ALL LIVING THINGS ARE COMPOSED OF CELLS.

The cell is the smallest unit able to perform three vital functions: nutrition, play and socialize.
In addition to the union of the cell, are born tissues and organs that make up living things evolved.

• The cytoplasm, viscous medium, where they have a series of small structures “organelles”, through which the cell performs a number of important functions for life and specific to each organelle.

• The cell membrane structure that surrounds the cytoplasm, isolated from the outside and is responsible for regulating the passage of certain substances, so its possible entry and exit of waste products, maintaining a balance between the intracellular and extracellular.

• The cell nucleus, where they are produced minicomputer from the orders they have to follow different AVAILABLE organs. The core DNA, nucleic acid important in the transmission of genetic information from heritable traits.

Organelle
Structures specific mission:
a) Ribosomes: are responsible for translating the messages coming from the core to the production of proteins that requires the cell.
b) Mitochondria: provide energy wing cell through cellular respiration.
c) Lysosomes: small membranous spheres that store digestive enzymes that help digest food.
d) The centriole: deals with cell movement and is involved in cell division.
e) The Golgi apparatus: in charge of releasing the products made outside the cell.
f) endoplasmic reticulum: Distributes, collects, stores and transports proteins made in the ribosomes. Lipids also manufactures and builds the nuclear membrane.

The cell as a structural unit of all living describes a being that alone or together with others is the ability of signaling functions at all.

As a functional unit tells us that she can perform vegetative functions: nutrition, circulation, respiration, excretion and secretion.