anatomia

Epithelium
http://www.accessscience.com//content/epithelium/238500
Article By:
Gersh, Prof. Isidore Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania.
Oneof the four primary tissues of the body, which constitutes the epidermis and the lining of respiratory, digestive, and genitourinary passages. The major characteristic of epithelium is that the cellsare close together, separated by a very small amount of intercellular substance. The epithelium (endothelium) lining the inner cavities of the heart, blood vessels, and lymphatics differs from that ofall the other groups because under abnormal conditions it may be transformed into a different type of cell characteristic of connective tissue, the fibroblast. Epithelium may be derived from any ofthe three primary germ layers of the very early embryo—ectoderm, endoderm, or mesoderm.

Gersh, Prof. Isidore. (2014). Epithelium. InAccessScience. McGraw-Hill Education. Retrievedfrom http://www.accessscience.com/content/epithelium/238500


Connective tissue
Article By:
Gersh, Prof. Isidore Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania.http://www.accessscience.com//content/connective-tissue/157300
One of the four primary tissues of the body. It differs from the other three tissues in that the extracellular components (fibers andintercellular substances) are abundant. It cannot be sharply delimited from the blood, whose cells may give rise to connective tissue cells, and whose plasma components continually interchange with and augmentthe ground substance of connective tissue. Bone and cartilage are special kinds of connective tissue. See also: Blood

Gersh, Prof. Isidore. (2014). Connective tissue. InAccessScience. McGraw-HillEducation. Retrieved from http://www.accessscience.com/content/connective-tissue/157300
Resumen
El tejido conectivo está compuesto por diferentes tipos de células que desempeñan las funciones de...