Epithelial Tissue Types Quiz

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Questions and Answers

What is the function of simple squamous?

Diffusion & filtration. Also secrete lubricating substances in serosae.

Describe simple squamous.

Single layer of flattened cells with central nuclei. Simplest epithelia.

Where is simple squamous located?

Kidney glomeruli 2. Alveoli of lungs 3. Lining of heart/blood vessels/lymph vessels 4. Lining of serosae

What does simple cuboidal look like?

Single layer of cube cells with large spherical nuclei in the center. Signup and view all the answers

What is the function of simple cuboidal?

Secretion and absorption. Signup and view all the answers

Where can you find simple cuboidal?

<ol> <li>Kidney tubules 2. Ducts & secretory portion of small glands 3. Ovary surface</li> </ol> Signup and view all the answers

What does simple columnar look like?

Single layer of tall cells with round/oval nuclei. (Some cells can have cilia or goblet cells) Signup and view all the answers

What is the function of simple columnar?

Absorption & secretion of mucus enzymes; The ciliated type propel mucus (or reproductive cells) by ciliary action. Signup and view all the answers

Where can you find non-ciliated simple columnar?

Lining of digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands. Signup and view all the answers

Where can you find ciliated simple columnar?

Lining small bronchi, uterine tubes, and some regions of the uterus. Signup and view all the answers

Describe pseudostratified columnar epithelium.

Single layer of cells in differing heights; some do not reach the free surface; nuclei at different levels; may contain goblet cells and bear cilia. Signup and view all the answers

What is the function of pseudostratified columnar?

Secretion (mucus) and propulsion of mucus by ciliary action. Signup and view all the answers

Where can you find pseudostratified columnar?

Non-ciliated: males sperm carrying ducts and ducts of large glands; ciliated: lines trachea and most of upper respiratory tract. Signup and view all the answers

What is the function of stratified squamous?

Protect underlying tissues from abrasion. Signup and view all the answers

What is the location of non-keratinized squamous epithelium?

Moist linings of esophagus, mouth, tongue, and vagina. Signup and view all the answers

What is the location of keratinized squamous epithelium?

Epidermis of skin. Signup and view all the answers

What are two rare types of epithelium?

Stratified cuboidal & stratified columnar. Signup and view all the answers

Where is stratified cuboidal located?

Ducts of adult sweat glands, esophageal glands, and part of male urethra. Signup and view all the answers

What is the function of stratified cuboidal?

Mainly protection. Limited secretion and absorption. Signup and view all the answers

Where is stratified columnar located?

Urethra, large ducts of some glands, small regions of the anus, part of the conjunctiva of the eye. Signup and view all the answers

What is the function of stratified columnar?

Protection and secretion. Signup and view all the answers

What is the description of transitional epithelium?

Surface cells dome shaped. Signup and view all the answers

What is the function of transitional epithelium?

Stretches readily and permits distention. Signup and view all the answers

Where can you find transitional epithelium?

Lines ureters, bladder, and part of urethra. Signup and view all the answers

What is metaplasia?

The reversible replacement of one mature cell by another, sometimes less differentiated cell type. Signup and view all the answers

In Barrett's esophagus, what happens to the stratified squamous?

They change to stratified columnar due to chronic irritation of gastric acid. Signup and view all the answers

What is dysplasia?

Deranged cell growth of a specific tissue that results in cells that vary in size, shape, appearance, and organization. Signup and view all the answers

What are the two frequent sites of dysplasia?

Female cervix and respiratory tract. Signup and view all the answers

Is dysplasia reversible?

True Signup and view all the answers

Is dysplasia a precursor to cancer?

True Signup and view all the answers

Study Notes

Simple Squamous Epithelium

Functions in diffusion, filtration, and secretion of lubricating substances in serosae.
Comprises a single layer of flattened cells with central nuclei; simplest form of epithelial tissue.
Found in kidney glomeruli, alveoli of lungs, lining of heart, blood vessels, lymph vessels, and serosae.

Simple Cuboidal Epithelium

Features a single layer of cube-shaped cells with large spherical nuclei in the center.
Functions primarily in secretion and absorption.
Located in kidney tubules, ducts and secretory portions of small glands, and the surface of ovaries.

Simple Columnar Epithelium

Characterized by a single layer of tall cells with round or oval nuclei; may contain cilia or goblet cells.
Functions in absorption and secretion of mucus and enzymes; ciliated types help in propelling mucus or reproductive cells.
Non-ciliated found in the lining of the digestive tract (stomach to anal canal), gallbladder, and some glands' excretory ducts; ciliated types are found in small bronchi, uterine tubes, and parts of the uterus.

Pseudostratified Columnar Epithelium

Composed of a single layer of cells of varying heights; some cells do not reach the surface and may contain goblet cells and cilia.
Functions in the secretion of mucus and propulsion of mucus via ciliary action.
Non-ciliated version found in males' sperm carrying ducts and large gland ducts; ciliated lines the trachea and upper respiratory tract.

Stratified Squamous Epithelium

Serves to protect underlying tissues from abrasion.
Non-keratinized type found in moist linings of the esophagus, mouth, tongue, and vagina; keratinized version forms the epidermis of skin.

Rare Types of Epithelial Tissue

Stratified cuboidal and stratified columnar epithelia are categorized as rare.
Stratified cuboidal located in ducts of adult sweat glands, esophageal glands, and parts of the male urethra; functions mainly in protection and limited secretion/absorption.
Stratified columnar found in the urethra, large ducts of some glands, small regions of the anus, and parts of the conjunctiva in the eye; functions in protection and secretion.

Transitional Epithelium

Characterized by dome-shaped surface cells.
Functions to stretch readily and permit distention.
Lines the ureters, bladder, and part of the urethra.

Metaplasia

Refers to the reversible replacement of one mature cell type by another, sometimes less differentiated type.
In Barrett's esophagus, stratified squamous epithelium transforms to stratified columnar due to chronic gastric acid irritation.

Dysplasia

Represents deranged cell growth resulting in variations in size, shape, appearance, and organization of cells.
Commonly seen in the female cervix and respiratory tract.
Dysplasia may be reversible if the inciting stimulus is removed and is considered a precursor to cancer.

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Description

Test your knowledge on various types of epithelial tissue, including their functions, descriptions, and locations. This quiz covers simple squamous epithelial tissue and more, providing essential information for understanding histology.