Epithelial Tissues Lecture - School of Health Sciences PDF

Prayer before study Lord, true source of light and wisdom, give me a keen sense of understanding, a retentive memory and the capacity to grasp things correctly. Grant me the grace to be accurate in my expositions and the skill to express myself with thoroughness and clarity. Be with me at the start...

Prayer before study Lord, true source of light and wisdom, give me a keen sense of understanding, a retentive memory and the capacity to grasp things correctly. Grant me the grace to be accurate in my expositions and the skill to express myself with thoroughness and clarity. Be with me at the start of my work, guide its progress and bring it to completion.  Human Histology (Lecture) MT120225 UNIT 2: EPITHELIAL TISSUE UST General Santos - School of Health Sciences Department of Medical Technology Second Semester A.Y. 2024-2025 Course Content I. EPITHELIAL CELLS II. EPITHELIAL DOMAINS III.COVERING OR LINING EPITHELIA IV. SECRETORY EPITHELIA AND GLANDS V. TRANSPORT ACROSS EPITHELIA VI.RENEWAL OF EPITHELIAL CELLS Unit Intended Learning Outcome: At the end of the unit, the student must be able to: Differentiate the different types of secretory epithelia based on their structure and the products they secrete 01 | Secretory Epithelia  Secretory Epithelia Epithelial cells that produce and secretes macromolecules may occur in epithelia with other major functions or comprise specialized organs called glands.  Function of Secretory Cells Synthesize, store, and release macromolecules Secrete water and electrolytes  Unicellular Gland: Goblet Cells Scattered secretory cells (unicellular glands) are common in simple cuboidal, simple columnar, and pseudostratified epithelium.  MEMORY CHECK!! Why do you think it’s very important for respiratory tract epithelium to have goblet cells? Exocrine Glands Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure Exocrine Glands: Based on Structure  MEMORY CHECK!! Differentiate exocrine from endocrine glands. MEMORY CHECK!! What are the key points for classifying exocrine glands? Exocrine Glands: Based on Manner of Secretions Exocrine Glands: Based on Manner of Secretions Exocrine Glands: Based on Manner of Secretions DID YOU KNOW? Did you know that acne vulgaris often arises from blocked ducts in sebaceous glands, a result of excessive sebum and keratin production triggered by puberty's hormonal changes?  MEMORY CHECK!! Differentiate the three types of exocrine secretion. Exocrine Glands: Based on Manner of Secretions Exocrine Glands: Based on Type of Secretions Mucous Serous Seromucous or Mixed Exocrine Glands: Based on Type of Secretions Exocrine Glands: Myoepithelial Cells  Endocrine Glands Lack myoepithelial cells Specialized for steroid or protein hormone synthesis ○ Proteins are released by exocytosis ○ Steroids are released via diffusion through the cell membrane 02 | Transport Across Epithelia 03 | Renewal of Epithelial Cells Epithelial Cell Renewal Most epithelial cells continuously renewing cell population In other epithelia (more complex glands, liver), epithelial cells belong to stable cell population ○ Little mitotic activity ○ Only divide when stimulated in response to injury The replacement cells are produced by mitotic activity of self-maintaining adult stem cells. MEMORY CHECK!! 1. Which of the following cellular features is used in naming types of epithelia? a. Shape of cells in the basal layer b. Number of cell layers c. Presence of a basal lamina d. Size of the nuclei e. Nature of the cell junctions that are present MEMORY CHECK!! 1. Which of the following cellular features is used in naming types of epithelia? a. Shape of cells in the basal layer b. Number of cell layers c. Presence of a basal lamina d. Size of the nuclei e. Nature of the cell junctions that are present MEMORY CHECK!! 2. Exocrine glands in which the acini all produce a secretion of heavily glycosylated, hydrophilic proteins are an example of which type of gland? a. Serous gland b. Mixed gland c. Mucous gland d. Tubuloacinar gland e. Simple gland MEMORY CHECK!! 2. Exocrine glands in which the acini all produce a secretion of heavily glycosylated, hydrophilic proteins are an example of which type of gland? a. Serous gland b. Mixed gland c. Mucous gland d. Tubuloacinar gland e. Simple gland  Human Histology (Lecture) MT120225 UNIT 2: EPITHELIAL TISSUE UST General Santos - School of Health Sciences Department of Medical Technology Second Semester A.Y. 2024-2025 Next Session: Quiz on Unit 2: Epithelial Tissues Please study Chapter 4 of Junqueira’s Basic Histology Text and Atlas References Mescher, A. (2023). Junqueira’s Basic Histology Text and Atlas (17th ed). McGraw Hill. Ross, M. and Pawlina, W. (2023). Histology: A Text and Atlas: With Correlated Cell and Molecular Biology. LWW. Dominican Blessing May God the Father bless us May God the Son heal us May God the Holy Spirit enlighten us Give us eyes to see with, ears to hear with, hands to do the work of God with, feet to walk with, and mouth to preach the word of salvation with; And may the angel of peace watch over us, and lead us at last by the Lord’s gift of the kingdom. Amen.