Their main function is to increase the surface area of epithelial cells. These empty-looking vesicles give the apical cytoplasm of mucus-producing cells a distinct "foamy" or "frothy" appearance.
Blood and lymph vessels as well as nerves penetrate the capsule and form a delicate network between the secretory units and the initial parts of the duct system. A secreting cell forming specific substances stores them until they are utilized—e. Lacunae are separated from one another as a result of the secretory activity of the chondrocytes.
There are several layers of polyhedral cells, and, finally, a layer of superficial cells, which have a convex, dome-shaped luminal surface. Some texts consider transitional epithelium as a specialised stratified epithelium while others group it with pseudostratified epithelia.
The number of epithelial cell layers will usually be the smallest number of layers visible anywhere along the surface lined by the epithelium. What is the function of this tissue. The bluish color of the basal cytoplasm reflects the presence of large amounts of rough endoplasmatic reticulum.
Many small lobules may form one large lobe. A disruption of the structure is a sign of injury or disease. Draw the epithelium and label the features you can see. What specific structure is indicated by the green star.
Distinguish the three kinds of cartilage. Draw the epithelium at high magnification and label your drawing. A single surface is usually not lined by several types of epithelia. What makes white fat "white" and brown fat "brown" under the microscope.
Slides Please select whether to view the slides in study mode or quiz mode. What is the function of the structure indicated by the red star. Basement Membranes hold the Epithelial cells to the underlying Connective Tissue.
This system consists of a number of tissue-specific, mobile, phagocytic cells that descend from monocytes - these include the Kupffer cells of the liver, the alveolar macrophages of the lung, the microglia of the central nervous system, and the reticular cells of the spleen.
That they should go away and leave him alone That they need to keep their mouths shut That they are alike.
Other stratified squamous in the body is nonkeratinized. The large body cavities and heart, blood vessels and lymph vessels are typically lined by a simple squamous epithelium.
Their number depends on the demand to reduce diffusion across the epithelium. Intermediate junctions surround the entire cell. How would you distinguish a fibroblast, macrophage, and mast cell under the light microscope. Identify the epidermal layer indicated by the letter A.
June 1, 0 Comments Epithelial Tissue Epithelial tissue is a sheet of cells that covers a body surface or lines a body cavity. Close to the surface of the epithelium, cells become more flattened. Stereocilia are, despite their name "cilia"not actively moving structures.
Multicellular glands The simplest form of a multicellular gland is a secretory epithelial sheath - a surface epithelium consisting entirely of secretory cells e. After fertilization the zygote gives rise to rapid mitotic cycles, generating many cells to form the embryo. Specialisations of the lateral and basal surfaces Connective tissue is responsible for the structural integrity of most organs.
The four types of tissues Epithelial tissuealso referred to as epithelium, refers to the sheets of cells that cover exterior surfaces of the body, lines internal cavities and passageways, and forms certain glands. What is the function of the structure indicated by the green star.
In this way the central nervous systemthe sensitive surfaces of special sense organs, glands, hair, nails, and other structures all originate. Identify the tissue type indicated by the letter A. This layer is usually named the basal cell layer, and the cells are called basal cells.
There are two additional mechanisms by which secretory cells can release their products. Simple epithelia— consist of a single cell layer found where absorption, secretion, and filtration occur.
For instance, in epithelia that absorb or secrete substances, the microvilli are extremely dense giving the cells a fuz zy appearance called a brush border. The basal lamina about 80 nm thick consists of fine protein filaments embedded in an amorphous matrix. slide #1 Once again, the first quiz question will cover what you should have learned up to this point and the second will ask about things you should know in addition to the first question if you're doing these units before the midterm or final.
An Online Examination of Human Anatomy and Physiology. Animated Text Narrations and Quizzes to Explain the Structures and Functions of the Human Body Systems.
Tissue Quiz Welcome to the QuizMoz Tissue Quiz. QuizMoz offers one of the Internet's largest collection of quizzes for you to tease your brain and pit your wits against the experienced QuizMoz quiz.
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A 'Hint' is available before answering the question. EPITHELIAL TISSUE. Click and hold on the answer space to see the possible answers. Then select the correct answer and release. Answer all questions and then hit the "Score Test" button at the bottom.Epithelial tissue quiz