Types of epithelial tissue and their functions pdf

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types of epithelial tissue and their functions pdf

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Describe the structural characteristics of the various epithelial tissues and how these characteristics enable their functions. Epithelial tissue primarily appears as large sheets of cells covering all surfaces of the body exposed to the external environment and lining internal body cavities.

If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus. Please consult the latest official manual style if you have any questions regarding the format accuracy. Despite its complexity, the organs of the human body are composed of only four basic tissue types: epithelial, connective, muscular, and nervous tissues.

Epithelial organisation revealed by a network of cellular contacts

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The emergence of differences in the arrangement of cells is the first step towards the establishment of many organs. Understanding this process is limited by the lack of systematic characterization of epithelial organisation.

Epithelium is a tissue composed of sheets of cells that are joined together in one or more layers. Epithelia cover the body surface, line body cavities and hollow organs, and form glands. Epithelial tissue forms a barrier between the body and the external environment and plays important roles in protection, filtration, absorption, excretion, and sensation. The rapid regeneration of epithelial cells is important to their protective function. Impervious barriers between cells tight junctions allow some epithelia as in the gut to tightly regulate flow of materials across them. Glands typically contain clusters of epithelial cells that either secrete their products such as hormones into the bloodstream or secrete products such as digestive enzymes by way of ducts onto an epithelial surface, such as the epidermis or stomach lining.

Epithelial organisation revealed by a network of cellular contacts

Epithelial tissue comprises one of the four basic tissue types. The others are connective tissue support cells, immune cells, blood cells , muscle tissue contractile cells , and nervous tissue. Organs represent various combinations of these four basic tissue types, which thus comprise the entire body. Each tissue type retains its fundamental character wherever it occurs. The boundary between you and your environment is marked by a continuous surface, or epithelium, of contiguous cells. The shape of this boundary is complex, continuing unbroken from skin through various orifices and including the many invaginations into the internal organs of the respiratory, urinary, digestive, and gastrointestinal tracts. Several of the body's organs are primarily epithelial tissue, with each cell communicating with the surface via a duct or tube.

Most epithelial tissues are essentially large sheets of cells covering all the surfaces of the body exposed to the outside world and lining the outside of organs. Epithelium also forms much of the glandular tissue of the body. Skin is not the only area of the body exposed to the outside. Other areas include the airways, the digestive tract, as well as the urinary and reproductive systems, all of which are lined by an epithelium. Epithelial cells derive from all three major embryonic layers. The epithelia lining the skin, parts of the mouth and nose, and the anus develop from the ectoderm.

Histology Epithelium — Functions and Types of Epithelial Tissue

The human body consists of four types of tissue: epithelial, connective, muscular, and nervous. Epithelial tissue covers the body, lines all cavities, and composes the glands. Epithelia tissue forms boundaries between different environments, and nearly all substances must pass through the epithelium. In its role as an interface tissue, epithelium accomplishes many functions, including:. Epithelial tissue is composed of cells laid out in sheets with strong cell-to-cell attachments.


Most epithelial tissues are essentially large sheets of cells covering all the surfaces of the body exposed to the outside world and lining the outside of organs. Epithelium also forms much of the glandular tissue of the body.

Key Points

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  • Most epithelial tissue is described with two names. Xilda S. - 28.03.2021 at 12:21
  • The following types of epithelial tissues are covered in this activity: 1. Simple squamous Stratified cuboidal epithelial tissue (salivary glands, sweat glands). 7. Stratified of the epithelia. Function: Allows passage of. Redlyte84 - 28.03.2021 at 23:20
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  • EPITHELIUM. • The basic tissue of the body. Epithelia are derived from all the 3 germ layers: Secretory. – Function as sensory surfaces. Tara R. - 03.04.2021 at 14:43