Classification Based on Their Shape: a. Squamous Epithelium: This type of tissue has cells with wider length than their height.
Further they are of three types: They mainly provide protection against abrasion and water loss. They produce intoxication, tearing and infections. A single organ consists of different types of epithelial tissue. Simple columnar epithelia lie in the female reproductive system and in the digestive tract. Simple Cuboidal Epithelium: These types of cells may have secretory, absorptive, or excretory functions. Textbook of Histology and Practical guide.

Most of the epithelial cells have capability to produce secretive macromolecules. Glandular epithelium is a type of striated epithelial tissue that covers the organs associated with secretion. Become fluent in medicine with video lectures and Qbank. You can find the answers below the references. Your email address will not be published. Image: Simple classification of epithelium. Because the cell nuclei appear at different heights, it conveys the erroneous impression that there is more than 1 layer of cells. They produce intoxication, tearing and infections. Protection Process: They act as selective barriers and protecting barriers. ISSN 20018762 . Epithelial cells regenerate on the basal membrane. Examples: collecting ducts of the kidney, pancreas, and salivary gland. They are mainly present in digestive tracts. These are formed from the close interaction between extracellular domains of two sets. Organ-Specific and Tissue-Specific Manifestation, Diseases- Types of Diseases and Their Symptoms, Cell Structure and Functions NCERT Solutions - Class 8 Science, NCERT Solutions for Class 11 Chemistry Chapter 4, NCERT Solutions for Class 12 Biology Chapter 15, NCERT Solutions for Class 11 Biology Chapter 16, NCERT Solutions for Class 11 Biology Chapter 20, NCERT Solutions for Class 12 Biology Chapter 13, NCERT Solutions for Class 11 chemistry chapter 2 – Structure of Atom, NCERT Solutions for Class 12 Biology Chapter 12, Class 11 Chemistry Revision Notes for Chapter 4 - Chemical Bonding and Molecular Structure, CBSE Class 12 Biology Revision Notes Chapter 13 - Organisms and Populations, CBSE Class 12 Biology Revision Notes Chapter 8 - Human Health and Disease, CBSE Class 12 Biology Revision Notes Chapter 12 - Biotechnology and its Applications, CBSE Class 11 Biology Revision Notes Chapter 20 - Locomotion and Movement, CBSE Class 11 Biology Revision Notes Chapter 16 - Digestion and Absorption, CBSE Class 12 Biology Revision Notes Chapter 15 - Biodiversity and Conservation, CBSE Class 11 Biology Revision Notes Chapter 21 - Neural Control and Coordination, CBSE Class 11 Biology Revision Notes Chapter 15 - Plant Growth and Development, CBSE Class 12 Biology Revision Notes Chapter 5 - Principles of Inheritance and Variation, Vedantu MCAT is a registered trademark of the Association of American Medical Colleges (AAMC).
By Kuebi (added translation), License: CC BY 3.0. By Phil Schatz, License: CC BY 4.0. It can be further subdivided depending upon the shape and function of the cells. This edema is an intercellular accumulation of fluid that can also converge into bubbles. 2020 Lecturio GmbH. The cells which form epithelial tissue are closely attached to each other through a structure called tight junctions. Umbrella cells (superficial cells) are large and often have 2 nuclei.

They mainly perform lubrication, protection process, and easy movement of material across the cell. The result is a compact organized epithelial node that can keratinize. It gives rise to the need to be clarified by further analysis. Based on the specialization of the glandular epithelium, we distinguish between exocrine and endocrine glands. 2. Stratified cuboidal epithelium: Their main function is secretive and protective process. Medically, the simple epithelium is further divided into 2 types: simple cuboidal epithelium and simple columnar epithelium.

The pancreas has the particular anatomical and physiological characteristics of having both types of glands. Image: Electron microscopic image of the basal lamina. These are located on the basal membrane. The outermost cell layers of the epithelium consist of flattened cells with no nuclei and cytoplasm, converting into scales. Epithelial tissue provides four key functions, they provide protection, they control permeability, they provide sensation, and they produce secretions. Example of such epithelial tissue is olfactory nasal mucosa, they detect the odors coming from outside and further transmit these information to the central nervous system. They have 1 surface that is not attached to any cell, either exposed to the external environment or the lumen of an organ. Simple squamous epithelium lies in the alveoli of the lungs and important for gases exchanging between lungs and blood. They form the digestive tract, the external skin, secretory glands, the inner lining of the mouth, the lining of hollow parts of every organ-like as lungs, heart, eyes, ear, urogenital tract, and also a ventricular system of the brain and central canals of the spinal cord. The epithelium composed of two or more layers of the cell is known as stratified epithelial. This is achieved by the tight junction lies between two epithelial cells. They grow in the stratified squamous epithelium. Register to leave a comment and get access to everything Lecturio offers! Goblet cells have mucosal membranes. As endocrine gland is also secretive in nature i.e it secretes hormones directly into the bloodstream and some of these hormones are insulin, tyroxin, etc.


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