Each one has different functions and is found in different locations within the body. Figure 4.2.2 summarizes the different categories of epithelial cell tissue cells. What is Epithelial tissue: It is the thin tissue that covers all exposed sides of the body. Where in the body would one find non-keratinizing stratified squamous epithelium? It is made up of closely packed cells in one or more layers. The Cardiovascular System: Blood Vessels and Circulation, 20.1 Structure and Function of Blood Vessels, 20.2 Blood Flow, Blood Pressure, and Resistance, 20.4 Homeostatic Regulation of the Vascular System, 20.6 Development of Blood Vessels and Fetal Circulation, Chapter 21. The secretions are enclosed in vesicles that move to the apical surface of the cell where the contents are released by exocytosis. Found in most of the digestive tract, like the stomach Found in the trachea (just remember cilia pushes mucus up, in the trachea) Nonkeratinized forms in all places mucous membranes are found Saliva, sweat and mammary glands all have these cuboidal stratified tissue Very rare, found in male urethra and large ducts of some glands. Exocrine glands are classified by the arrangement of ducts emptying the gland and the shape of the secretory region. Chapter 1. Unicellular glands are individual cells which are scattered throughout an epithelial lining. A gland is a structure made up of one or more cells modified to synthesize and secrete chemical substances. To Protect, Absorb, Support, Filter, form Slippery Surfaces ... Rare, but sometimes found in small amounts in ducts of some glands and male uretha. In the circulatory system, epithelial tissue can be found in the structure of the arteries, veins, and capillaries, and it also covers the heart. Most glands consist of groups of epithelial cells. Muscle tissue also creates involuntary movement inside our bodies in every organ system. Methods and Types of Secretion Services, Types of Muscle Tissue: Skeletal, Cardiac & Smooth, Working Scholars® Bringing Tuition-Free College to the Community. Epithelial tissue is classified based on the shape of the cells present and the number of cell layers present. Sign in|Recent Site Activity|Report Abuse|Print Page|Powered By Google Sites, This is a type of protective tissue that covers the entire body. In addition, epithelial tissue is responsible for forming a majority of glandular tissue found in the human body. A gland can be classified as an endocrine gland, a ductless gland that releases secretions directly into surrounding tissues and fluids (endo- = “inside”), or an exocrine gland whose secretions leave through a duct that opens to the external environment (exo- = “outside”). Exocrine glands release their products through ducts. (Figure 4.2.2) Cell shapes are classified as being either squamous (flattened and thin), cuboidal (boxy, as wide as it is tall), or columnar (rectangular, taller than it is wide). This epithelial type is also found composing the mesothelium which secretes serous fluid to lubricate the internal body cavities. Multicellular exocrine glands are composed of two or more cells which either secrete their contents directly into an inner body cavity (e.g., serous glands), or release their contents into a duct. These tissue types include epithelial, connective, muscular, and nervous tissue. The different types of epithelial tissues are characterized by their cellular shapes and arrangements: squamous, cuboidal, or columnar epithelia. Structures found on some epithelial cells are an adaptation to specific functions. View the University of Michigan WebScope at http://virtualslides.med.umich.edu/Histology/Digestive%20System/Intestines/169_HISTO_40X.svs/view.apml to explore the tissue sample in greater detail. Alternatively, the lining of the oral cavity is an example of an unkeratinized, stratified squamous epithelium. Bone Tissue and the Skeletal System, 6.6 Exercise, Nutrition, Hormones, and Bone Tissue, 6.7 Calcium Homeostasis: Interactions of the Skeletal System and Other Organ Systems, 7.6 Embryonic Development of the Axial Skeleton, 8.5 Development of the Appendicular Skeleton, 10.3 Muscle Fiber Excitation, Contraction, and Relaxation, 10.4 Nervous System Control of Muscle Tension, 10.8 Development and Regeneration of Muscle Tissue, 11.1 Describe the roles of agonists, antagonists and synergists, 11.2 Explain the organization of muscle fascicles and their role in generating force, 11.3 Explain the criteria used to name skeletal muscles, 11.4 Identify the skeletal muscles and give their origins, insertions, actions and innervations, Chapter 12. Stratified Epithelium Stratified epithelium differs from simple epithelium by being multilayered. The Lymphatic and Immune System, 21.1 Anatomy of the Lymphatic and Immune Systems, 21.2 Barrier Defenses and the Innate Immune Response, 21.3 The Adaptive Immune Response: T lymphocytes and Their Functional Types, 21.4 The Adaptive Immune Response: B-lymphocytes and Antibodies, 21.5 The Immune Response against Pathogens, 21.6 Diseases Associated with Depressed or Overactive Immune Responses, 21.7 Transplantation and Cancer Immunology, 22.1 Organs and Structures of the Respiratory System, 22.6 Modifications in Respiratory Functions, 22.7 Embryonic Development of the Respiratory System, 23.2 Digestive System Processes and Regulation, 23.5 Accessory Organs in Digestion: The Liver, Pancreas, and Gallbladder, 23.7 Chemical Digestion and Absorption: A Closer Look, 25.1 Internal and External Anatomy of the Kidney, 25.2 Microscopic Anatomy of the Kidney: Anatomy of the Nephron, 25.3 Physiology of Urine Formation: Overview, 25.4 Physiology of Urine Formation: Glomerular Filtration, 25.5 Physiology of Urine Formation: Tubular Reabsorption and Secretion, 25.6 Physiology of Urine Formation: Medullary Concentration Gradient, 25.7 Physiology of Urine Formation: Regulation of Fluid Volume and Composition, Chapter 26.
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