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22 terms

Epithelial Tissue

Study the different kinds of epithelial tissues in this set of slides. learn to identify the tissues visually and learn where to find them in the body.
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Simple Squamous
- Important locations:
Air sacs of the lungs, lining of the heart, and blood vessels
Simple Cuboidal
- Important Locations:
kidney tubules, and ovary surface
Simple Columnar
- Important locations:
Non-ciliated types located in the digestive tract

ciliated line small bronchi, uterine tubes and some regions of the uterus
Psuedostratified ciliated Columnar
- Important locations:
Ciliated lines the trachea
Non-ciliated type located in males sperm carrying duct;
Stratified Squamous
- Important locations:
non-keratinized type forms the moist lining of the esophagus, mouth and vagina.
Keratinized variety forms the epidermis of the skin, a dry membrane.
Stratified Columnar
Has limited distribution throughout the body. Small amounts are found in the pharynx, the male urethra and lining some glandular ducts.
Transitional
- Important Locations:
Lines the uterus, bladder and part of the urethra
Simple Epithelia
consists of a single layer of cells - typically found where absorption, secretion, and filtration occur
Stratified epithelia
consisting of two or more cell layers - common in high abrasion areas where protection is important, such as the skin and the lining of the mouth
Secretion
a functionally specialized substance (especially one that is not a waste) released from a gland or cell
Goblet cell
Unicellular gland produces mucin, precusor to mucus, which protects, covers, and lubricates many internal body surfaces
Simple squamous description
Single layer of flattened cells with disc shaped central nuclei and sparse cytoplasm
Simple cuboidal description
SIngle layer of cube like cells with large spherical nuclei.
Simple columnar description
Single layer of tall cells with round to oval nuclei; some cells bear cilia; layer may contain mucus secreting unicellular glands (goblet cells)
Pseudostratified columnar description
Single layer of cells of differing heights, some not reaching the free surface; nuclei seen at different levels often contain mucus secreting cells goblet cells; usually have cilia.
Stratified squamous description
Thick membrane composed of several cell layers; basal cells are cuboidal or columnar and metabolically active; surface cells are flattened (squamous); in the keratinized type, the surface cells are full of keratin and dead; basal cells are active in mitosis and produce the cells of the more superficial layers
Transitional Epithelia description
Resembles both straified squamous and stratified cuboidal; basal cells cubodial and columnar, some cells appear to have two nuclei,surface cells dome shaped
Function of simple squamous
Allows for diffusion and filtration of many different substances and secretes lubricating substances
Function of simple cuboidal
Secretion and Absorbtion
Function of simple columnar
Secretion and Absorbtion; ciliated type propels mucus
Function of stratified squamous
Protects underlying tissues in areas subjected to abrasion
Function of transitional
Stretches readily, permits storage of urine to distend urinary organ also stretches to provide space for developing fetus inside the uterus