This is a photo of a human hand. A human hand contains epithelial tissue. Epithelial tissue is tissue all over the human body that forms the external skin. It also forms the inner lining of the mouth, digestive tract, secretory glands, lining of every organ including brain, and also central canals of the spinal cord. The cells that make up the epithelial tissue are connected to each other with specialized structures called tight junctions. Epithelial cells are free from nerves and blood vessels. This tissue is very important as it acts as protection against abrasion, radiation, chemical stress, and invasion of pathogens. Epithelial tissue also acts as barrier between two structures. This allows organs to be close together but at the same time focus on their own function. There are different types of epithelial tissue. Simple epithelium are made of single cell layers and can be found in the alveoli of the lungs. Stratified epithelium contains multiple layers of cells and are known as protective tissue; this type of tissue is found on the external layer of skin. The human hand contains stratified epithelial tissue as it is found externally and acts as a protectant against harmful encounters.
Editors. “Epithelial Tissue - Definition, Types, Function & Examples of Epithelium.” Biology Dictionary, Biology
Dictionary, 28 Apr. 2017, biologydictionary.net/epithelial-tissue/.
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