Act 3epithial Tissue.docx

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Group Members: Alcoy, Jessa Ann G. Gino, Alexa Shaira Pearl A. Pangapalan, Myrvonne Jane G. Rosalejos, Ahlaiza Mae G. Tupiasan, Gracel Hayde D. Year/Section: 4th Year Bs Biology 4C

Date: Feb. 04, 2019

Group No. 5

Activity No. 3 Epithelial Tissues Small intestine of frog (Simple Columnar Epithelium)

Simple Columnar Epithelium

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Simple columnar epithelia are tissues made of a single layer of long epithelia cells that are often seen in regions where absorption and secretion are important features. The cells of this epithelium are arranged in a neat row with the nuclei at the same level, near the basal end. References: http://www.austincc.edu/histologyhelp/tissues/td_sim_col_e.html Cuboidal Epithelium Simple Cuboidal Epithelium

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Simple cuboidal epithelium is found in organs that are specialized for secretion, such as salivary glands and thyroid follicles, and those that are specialized for diffusion, such as kidney tubules. As its name implies, this tissue consists of single layer of cuboidal cells on the basement membrane. The cells of this type of tissue can withstand more trauma than simple squamous

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epithelia and are adapted for diffusion and secretion. This is one of the specializations found in epithelial tissues. References: https://bio.rutgers.edu/~gb102/lab_6/601cm-simplecu.html Human Urinary Bladder

folded mucosa smooth muscle layers

lumen

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Transitional epithelium

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Urinary Bladder at 40X magnification. An example of transitional epithelium tissue. It is found in only three organs: ureters, urinary bladder, and part of the urethra. The transitional epithelium cells stretch readily in order to accommodate fluctuation of volume of the liquid in an organ. (The distal part of the urethra becomes non-keratinized stratified squamous epithelium in females; the part that lines the bottom of the tissue is called the basement membrane.) References: Marieb, E., & Hoehn, K. (2013). Human anatomy & physiology (9th ed., pp. 122124). Boston: Pearson. Olfactory Epithelium

Olfactory epithelium

Basal epithelial cells

Browmann’s gland

mucosa

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The epithelium is ciliated pseudostratified columnar epithelium which are found in places such as the trachea and upper respiratory tract, where Magnification: 400x their cilia and mucous secretions help collect foreign materials so you can cough or sneeze them out. References: https://study.com/academy/lesson/pseudostratified-columnar-epitheliumlocation-function.html

Columnar Epithelium Section

Goblet cell

Brush border lumen Simple columnar epithelium

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Simple columnar epithelium can be seen under the 40x magnification lens. We can say that it is a simple columnar epithelium because it only has a single layer of epithelial cells, these cells appear like thin columns, which make it different from flattened squamous cells and squareshaped cuboidal cells, and it can be seen in regions where absorption and secretion are important features. This type of columnar epithelium can mostly found in the organs of the digestive tract of humans including stomach, small intestine and large intestine. References: https://biologydictionary.net/simple-columnar-epithelium Frog Squamous Epithelial Tissue Simple Squamous Epithelial Tissue

Simple Columnar Epithelium

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Other cell present: Simple Columnar Epithelial Cells

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Simple squamous epithelia are found in a variety of locations, starting from capillaries to the alveoli of lungs, and nephrons of kidneys. Squamous Epithelium can be seen in small blood vessels (capillaries), for it can diffuse materials out of the capillaries, and it can also be seen in the air sacs of the lungs (alveoli) so that oxygen can diffuse across the alveoli and into the blood. squamous epithelial cells in the kidney enable rapid filtration of the blood and diffusion of small molecules. This process allows the kidneys to remove waste products and excess water from the body in the urine. It is also present in skin because the thin, flattened cells promote rapid diffusion of gasses between the air and the blood vessels underneath the epithelium. References: https://biologydictionary.net/simple-squamous-epithelium/ https://bio.libretexts.org/Under_Construction/Purgatory/Core_Construction/BIO_102/Reading_a nd_Lecture_Notes/Animal_Tissues https://www.livestrong.com/article/192286-what-are-the-functions-of-simple-squamousepithelial-cells/ Human Duodenum

Enterocyte (Simple Columnar Lumen Epithelium)

Villi Mucosa

Intestinal Gland

Submucosa

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A simple columnar epithelium is a columnar epithelium that is single layered. In humans, it is found most organs of the digestive tract including the stomach, small intestine, and large intestine. Non-ciliated types are found in the digestive tract. The mucosa forms fingerlike projections called villi that extend into the intestinal lumen. These are epithelial folds lined by two types of cells, enterocytes and goblet cells. Enterocytes are simple columnar cells with basal elongated nuclei and an apical brush border. The brush border is the microscopic representation of small protrusions of the cell membrane, microvilli, which greatly increase the surface area of the cell enhancing absorptive capacity. Reference: https://www.proteinatlas.org/learn/dictionary/normal/duodenum