Epithelial Tissue Flashcards
Where is simple squamous epithelium located?
Kidney, air sacs of lungs (alveolar), lining of heart, blood vessels, lining of ventral body cavity
What is the function of simple squamous epithelium?
Allows materials to pass by diffusion and filtration in sites where protections is not important. secretes lubricating substances.
Where is simple cuboidal epithelium located?
Kidney tubules, ducts and secretory portions of small glands, ovary surface
What is the function of simple cuboidal epithelium?
Secretion and absorption
Where is simple columnar epithelium located?
Nonciliated: digestive tract, gallbladder, exretory ducts of some glands. Ciliated: small bronchi, uterine tubes, some regions of the uterus.
What is the function of simple columnar epithelium?
Absorption, secretions of mucus + enzymes, etc. ciliated type propels mucus or reproductive cells by ciliary action.
Where is pseudostratified columnar epithelium located?
Nonciliated type: in male’s sperm carrying ducts and cuts of large glands Ciliated: lines the trachea, most of the upper respiratory tract
What is the function of pseudostratified columnar epithelium?
Secretes substances, particularly mucus, propulsion of mucus by ciliated action
Where is stratified squamous epithelium located?
Non-keratinized: moist linings of the mouth, esophagus, and vagina Keratinized: forms the dry epidermis of the skin
What is the function of stratified squamous epithelium?
Protects underlying tissues in areas subjected to abrasion.
Where is stratified cuboidal epithelium located?
Largest ducts of sweat glands, mammary glands and salivary glands.
What is the function of cuboidal epithelium?
Protection.
Where is stratified columnar epithelium located?
Rare. small amounts in male urethra and in large cuts of some glands.
What is the function of stratified columnar epithelium?
Protection and secretion.
Where is transitional epithelium located?
Lines the ureters, urinary bladder, and part of the urethra.
What is the function of transitional epithelium?
Stretches readily and permits distension of urinary organ by contained urine.
Simple Squamous Epithelium
Single layer of flattened cells with disc shaped central nuclei and sparse cytoplasm.
Simple squamous epithelium
Simple Cuboidal Epithelium
Single layer of cube like cells with large spherical central nuclei
Simple Cuboidal Epithelium
Simple columnar epithelium
Single layer of tall cells with round to oval nuclei, some cells bear cilia, layer may contain mucus secreting unicellular glands or goblet cells
Simple columnar epithelium
Pseudostratified columnar epithelium
Single layer of cells of differing heights, some not reaching the free surface, nuclei seen at different levels, may contain mucus secreting goblet cells or bear cilia
Pseudostratified columnar epithelium
Stratified squamous epithelium
Thick membrane composed of several cell layers, basal cells are cuboidal or columnar and metabolically acive, surface cells are flattened.
keratinized: surface cells are dead and full of keratin. basal cells produce the cells of the superficial layers via mitosis.
Stratified squamous epithelium
Stratified cuboidal epithelium
Generally two layers of cubelike cells
Stratified cuboidal epithelium
Stratified columnar epithelium
Several cell layers, basal cells usually cuboidal superifical cells elongated and columnar.
Stratified columnar epithelium
Transitional epithelium
Resembles both stratified squamous and stratified cuboidal depending on degree of organ stretch
Transitional epithelium
