Human tissues is a structure of cells and extracellular beings, historically.Each structure has certain morphological and functional characteristics unique to her.In the body interact all human tissue.This provides morphological and functional unity in it.
Types of human tissues
There are four types of cell structures.In the body there is epithelial, nerve, muscle and connective tissue.
Border (epithelial) structure includes epithelial cells that line the surface of the body, mucous cavities and internal organs in the body and form glands and internal and external secretion.
Cells Human epithelial tissue lining the mucosa, are located in the basement membrane.The inner surface of this layer is exposed directly to the environment.Feeding of the epithelial tissue is carried out by diffusion of oxygen and substances through the basement membrane of blood vessels.
Depending on the shape of the cells are classified flat (skin), cylindrical (intestine), cubic (capsule renal glomerulus) layer.Depending on the number of layers differentiate single and multilayer fabric.If all cells in the structure of the membrane is achieved, then this single layer of epithelium.When membrane bound cells only in one row, and in the other they are free, that is - stratified epithelium.Single-layer epithelial tissue can be single-core or multi-core.This depends on the level at which the nuclei are situated.In some cases present in the structure facing the external environment ciliary cilia.
very diverse structure of the connective tissue is human.However, all its variants are formed from mesenchyme (middle germ layer).By connecting structure should be classified as fibrous, cartilaginous, lymphatic, hematopoietic tissue and blood.All of these species belong to the structures of the internal environment.
The blood corpuscles contain: platelets, white blood cells, red blood cells.In addition, it is present in the liquid plasma.In plasma, are hormones, immune body nutrients.In the bone marrow (red) is hematopoietic tissue.In the lymph nodes, the intestinal mucosa, the liver, spleen, thymus and other organs of the lymphatic structure is located.Connective tissues
fibrous structure, besides the cells, and include other elements.They, in particular, shows an intermediate represented in the form of collagen, elastin, argiofilnyh and reticular fibers which are enclosed in a basic substance.
in all tissues and organs, connective tissue fibers are present.However, they are most pronounced where there is a large mechanical load.
The bone structure of the present bone cells.They have the ability to form an intermediate, which includes and mineral salts as well as connective tissue fibers.
cartilaginous structure is divided into hyaline, elastic and fibrous cartilage.In fibrocartilage contained hondrin with a sufficient amount of collagen fibers to impart strength to cartilage.The elastic cartilage layer hondrin than collagen, elastic fibers and contains cartilage cells, thereby it has a certain degree of elasticity.Hyaline structure is sufficiently dense, but less strong compared to others.By
human muscle tissue include cardiac muscle, smooth and striated fibers.Due to this structure, the reduction is carried out of the blood vessels and internal organs, as well as the movement of body parts.Reduction of striated muscle happens by the will of man.Cardiac muscle and smooth the fiber part of the structure of the internal organs.They do not obey the wishes of the person.
