Epithelium Formative Assessment PDF

**Formative Assessment** **Epithelium** **Biomedical Science** **Nicole Olliver** A group of organized \_\_\_cells\_\_\_\_\_\_\_ working together forms \_\_\_tissue\_\_\_\_\_\_\_. An organized group of the latter work together to form \_\_\_organs\_\_\_\_\_\_\_. a. tissues; organs; cells b....

**Formative Assessment** **Epithelium** **Biomedical Science** **Nicole Olliver** A group of organized \_\_\_cells\_\_\_\_\_\_\_ working together forms \_\_\_tissue\_\_\_\_\_\_\_. An organized group of the latter work together to form \_\_\_organs\_\_\_\_\_\_\_. a. tissues; organs; cells b. organs; cells; tissue c. cells; tissue; organs Tissue that covers a body surface of lines a body cavity, forms parts of most glands is known as what? Epithelial Tissue- this is a protective barrier and its function is absorption, secretion and sensation. Epithelial tissue can be located on the skin, lining of organs and glands. What three features are used to classify epithelia?  Epithelia can be classified by the number of cell layers. Simple epithelium, which is a single layer of cells. Stratified epithelium, which is multiple layers of cells. Also Pseudostratified epithelium, which appears to be multiple layers of cells but however is only one layer. Secondly, the cell shape can be used as a classification. Squamous shape is flat and thin. Cuboidal is a cubelike shape and columnar is a more rectangular shape where there is more height than width. Lastly, transverse epithelium. Which are multiple layers, but the cells are able to change shape. When the cells are stretched, they become pear sharped compared to a more flattened shape when they are not stretched. What shapes of epithelial cells are found on the surface of epithelia?  Squamous, cuboidal and columnar. What specializations are found on the apical surface of epithelial cells and their function?  Cilia which are hairlike structures which project upwards from the apical surface of the epithelial cells. Their function is to move substances along the surface and are usually located in the respiratory tracts aiding the movement of mucus, or in the fallopian tube aiding the movement of the oocyte. What are the two specialized forms of epithelia?  What separates an epithelium from the underlying connective tissue?  The basement membrane consists of the basal lamina which contains protein and collagen anchoring the epithelial cells. Also, the reticular lamina which contains collagen fibres which connect to the connective tissue. a. Columnar b. Stratified c. Squamous d. Transitional **Which of the following is the epithelial tissue that lines the interior of blood vessels?** a. Columnar b. Pseudostratified c. Simple Squamous d. Transitional **Which type of epithelial tissue specializes in moving particles across its surface and is found in airways and lining of the oviduct?** a. **Stratified Columnar** b. **Transitional** c. **Stratified Squamous** d. **Pseudostratified ciliated columnar** What are the 5 functions of epithelium? Protection, absorption, secretion, excretion and sensation What are the 5 characteristics of epithelium? **Cellularity, polarity, supported by connective tissues, Avascular and regeneration.** What Epithelium lines the Oral Cavity? Non-Keratinised Stratified squamous epithelium to help protect from abrasion and friction in the oral cavity whilst remaining moist. What Epithelium covers the hard palate and the tongue and the external surface of the gingiva? Keratinised stratified squamous epithelium to help protect from friction and abrasion. What epithelium is found within salivary glands? Simple cuboidal epithelium due to the needed function of secretion and absorption. What membrane is found inside the oral cavity and where is its lubricant formed? The mucous membrane which is composed of stratified squamous epithelium and its function is to remain moist and aid in the movement of chewing and swallowing whilst protecting tissues. The lubricant is formed by the salivary glands (including the parotid, submandibular and sublingual glands) which produces saliva. What is the difference between an endocrine gland and an exocrine gland? Please give an example of both The endocrine glands secrete hormones directly into the bloodstream, which then travel through the circulatory system to its target organs/tissues. An example would be the thyroid gland which secretes thyroxine and triiodothyronine aiding in the regulation of metabolism, growth and development. The exocrine glands have ducts where secretions such as sweat, or saliva are able to travel in the body's surface or cavities. An example would be the salivary glands which secrete saliva into the oral cavity through ducts which help with digestion and lubrication. What types of epithelium are pictured below? simple squamous epithelium a. Top of Form Simple cuboidal epithelium stratified squamous epithelium