Provide physical protection Control permeability Provide sensation Produce specialized secretions There are various specialized types of epithelia. They can be sorted by cell shape and the number of cells between the basement membrane and the exposed surface of the epithelium. The three basic shapes of epithelial are squamous, cuboidal, and columnar. If the basement membrane is only covered by one layer of cells it is called a simple epithelium. If the basement membrane is cover by several layers of cells it is called stratified epithelium.
Some organ systems are: the integumentary, nervous, sensory, endocrine, skeletal, muscular, circulatory, immune, digestive, respiratory, excretory, and reproductive systems. Embryonic Tissues Ectoderm, mesoderm, and endoderm are embryonic tissues that give rise to all of the tissues, organs, and organ systems in the body. Ectoderm forms the outer layer of skin and nervous system. Mesoderm forms the muscles, connective tissues, skeleton, kidneys, and circulatory and reproductive organs. Endoderm forms the lining of the gut, respiratory tract, and urinary bladder.
Stratified epithelial cells consist of two or more layers of epithelial cells. They are found found in areas where most of the wear and tear of the body takes place. Our body contains four different membranes (physical barriers), each with a specific function. Understanding their different roles and functions, please describe what you think would happen to the body if each was damaged? If each membrane is damaged, the epithelium would not be able to be held up.
7. Compare and contrast cells and tissues. Tissue is made up of cells. Tissues make systems. The cells in a tissue may not be identical to each other, but the origin is the same for each one.
EPITHELIUM By: Khalid Al-Kraida Anatomy Department College of Medicine KSU INTRODUCTION TO THE CONCEPT OF EPITHELIUM FEATURES OF EPITHELIUM: Epithelium lines the surfaces of the body and is mainly located on the borders between the external and internal environments. Epithelium also lines all the internal body spaces that have a connection with the external environment at some stage. Epithelium is a tissue composed of cells; tightly-bound to each other, with little intercellular substance. There are specializations of the cell membranes of epithelial cells that play roles in maintaining the integrity of the tissue. Epithelium is an avascular tissue and has no integral (direct) blood supply.
This specific tissues has an arrangement made up of loose fibers. The rest of the matrix is held together by ground substance (holds the body fluids) but otherwise when viewing under a microscope there seems to be a lot of empty space. Essentially all body cells obtain their nutrients from and release their wastes into the empty space in this tissue fluid. It is widely distributed under epithelia of the body. Adipose tissue’s structure and function is similar to areolar tissue but its ability to store nutrients is much greater.
The salivary glands make saliva. Saliva keeps the mouth and other parts of the digestive system wet. It also helps break down carbohydrates (with salivary amylase, formerly known as ptyalin) and keeps food wet and slippery so it can go down from the oro-pharynx to the esophagus to the stomach. There are three main pairs of salivary glands. They are the parotid, the submandibular and the sublingual glands.
Tissues and Tattoos The four types of tissue are epithelia, connective tissue, muscle tissue and neural tissue. They are all different but all serve a general purpose to cover, fill and protect what is underneath. Epithelia cover exposed surfaces, line internal passageways, chambers and produce glandular secretions. Connective tissues are responsible for filling internal spaces, provide structural support and store energy. Muscle tissue contract to produce active movement.
Classification of Tissues Objective: The purpose of this lab exercise is was that know the various tissues found in the human body, and to familiarize myself with their composition and function. I learned that the four primary tissue types in the human body are epithelium, connective tissue, nervous tissue, and muscle tissue. These tissues have unique structures, patterns, and functions. I identified the subcategories of the tissues using a compound light microscope. I had to list the general functions and structural characteristics of the primary tissues.
Please refer to the figure below to understand all the three layers. Each layer has it own function and own importance in maintaining the integrity of skin and thereby the whole body structure. So lets, study each part in detail. 1. Epidermis: Epidermis is the topmost layer or rather the visible part of the skin that is composed of stratified squamous epithelial cells.