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Types of Epithelial Cells

Keratinized Epithelia
Keratinized Epithelia

Functions of epithelial cells include secretion, absorption, protection, transcellular transport, sensation detection, and selective permeability. Endothelium (the inner lining of blood vessels) is a specialized form of epithelium.

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Pseudostratified
Pseudostratified

Pseudostratified ciliated columnar epithelium cells function as a protective layer in the respiratory system of humans, according to CliffsNotes. These specialized cells feature rectangular shapes, vertical appearances and hair-like cilia on the end, while the nucleus is near the base.

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Pseudostratified Columnar
Pseudostratified Columnar

Pseudostratified ciliated columnar epithelium cells function as a protective layer in the respiratory system of humans, according to CliffsNotes. These specialized cells feature rectangular shapes, vertical appearances and hair-like cilia on the end, while the nucleus is near the base.

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Simple Columnar
Simple Columnar

A simple columnar epithelium is a columnar epithelium that is uni-layered. In humans, a simple columnar epithelium lines most organs of the digestive tract including the stomach, small intestine, and large intestine.

Simple Cuboidal
Simple Cuboidal

Simple cuboidal epithelium is a type of epithelial tissue found in the body. It is a single layer thick and made of cube-shaped cells. This type of tissue is found lining parts of the body such as the kidney tubules and walls of the respiratory bronchioles.

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Simple Epithelia
Simple Epithelia

The cells found in this epithelium type are flat and thin, making simple squamous epithelium ideal for lining areas where passive diffusion of gases occur. Areas where it can be found include: skin, capillary walls, glomeruli, pericardial lining, pleural lining, peritoneal cavity lining, and alveolar lining.

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Simple Squamous
Simple Squamous

Simple squamous epithelium lines the air sacs, or alveoli, of the lungs. The alveoli are sites where air is exchanged in the lungs. Simple squamous epithelial cells in the alveoli allow oxygen from the air to enter the blood in the capillaries of the lung.

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Simple Squamous Alveoli of Lungs
Simple Squamous Alveoli of Lungs

Simple squamous epithelium lines the air sacs, or alveoli, of the lungs. The alveoli are sites where air is exchanged in the lungs. Simple squamous epithelial cells in the alveoli allow oxygen from the air to enter the blood in the capillaries of the lung.

Stratified Cuboidal
Stratified Cuboidal

Stratified cuboidal epithelium is a type of epithelial tissue composed of multiple layers of cube-shaped cells. Only the most superficial layer is made up of cuboidal cells, and the other layers can be cells of other types.

Stratified Epithelium
Stratified Epithelium

For squamous stratified epithelium, there is a third sub-classificational feature: the keratinization, or lack thereof, of the apical surface domains of the cells. A typical example of stratified squamous keratinized epithelium is the epidermis.

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Stratified Squamous Keratinized
Stratified Squamous Keratinized

A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basal membrane. Only one layer is in contact with the basement membrane; the other layers adhere to one another to maintain structural integrity.

Stratified Squamous non-Keratinized
Stratified Squamous non-Keratinized

The layers of flat dead cells-stratum corneum or horney layers are present. 3. It forms epidermis of the skin of land vertebrates. 4. It prevents loss of loss of water and mechanical injury. Non-kertinized Epithelium: 1. It has living squamous cells at the surface. 2. Strtum corneum absent as non-kertinization or cornification occurs. 3.

Transitional
Transitional

The presence of epithelial cells in urine can be as a result of normal sloughing of the epithelial tissues and may not necessarily indicate any abnormalities. The ureters, which are responsible for carrying urine from the body, are lined with epithelial tissues.

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Transitional Epithelia
Transitional Epithelia

Transitional epithelium is a type of stratified epithelium – tissue consisting of multiple layers of epithelial cells which can contract and expand as needed. It is so named because of this function in the transition of degree of distension.

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