Tissue is a term that is used as an adjective, it serves to refer to everything related to the tissues of a certain organism. The most appropriate field to refer to this term is the scientific one, which is used from the point of view of the composition of organisms to the clinical study. A tissue composition is that set of cells that can form a tissue of all possible levels.

Basically, tissues such as those of animals are made up of two types of levels, the first of which is the simple tissue level, which is when the cells come from a function that has always been the same and is only one, in the studies we find various forms of cellular tissues, such as cells that pigment the skin, nails, hair. Its composition is basic and its study is to determine any anomaly present in its formation.

The second level is to describe that set of cells that, despite being different, share a single objective, having different compositions. It is called upper or compound tissue level because this tissue is made up of different cells, all with different origins capable of acting related to guarantee the function of an organ. An example of a higher tissue level is that which is present in the stomach, which is an organism of diverse composition, the most notable being the relationship between the cells that make up the stomach wall with those that serve to cover it with a protective mucosa. of acids to it.