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Tissues in the Body

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Tissues in the body
In biology, tissue is a cellular organizational level intervening between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
Epithelial Tissue
Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers. This tissue is specialized to form the covering or lining of all internal and external body surfaces. Epithelial cells are used for protection, absorption and secretion. Cell shapes found in epithelial tissue are squamous, cuboidal, columnar and transitional. Epithelial tissue is highly specialised for selective secretion and absorption of ions and molecules.
Squamous: Squamous cells make up most of the cells in the outer layer of the skin. They have the appearance of thin, flat plates. Squamous cells form the lining of cavities such as the mouth, blood vessels, heart and lungs and make up the outer layer of the skin.

Cuboidal: By lining the surface of various ducts of various glands and organs, simple cuboidal cells are able to provide a layer of protection from abrasion, foreign particles, invading bacteria and excessive water loss to the underlying tissue. In the kidney tubulus, the cells aid in the absorption and transport of filtered substances. Simple cuboidal consists of a single layer of cells with the same height and width. The cells are equally wide as they are tall creating a square profile with a spherical nucleus at its centre.

Columnar: Simple columnar is a single layer of tall, closely packed cells that line the digestive tract from the stomach to the rectum. Functions include absorption and secretion. They contain dense microvilli on their apical surface. Columnar cells receive nutrients

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