Characteristics of Epithelial Tissues

Covers and lines body surfaces, cells are densely packed together, cells are firmly attached by intercellular junctions, cells rest on a basement membrane.

Anchors epithelium to underlying connective tissue, acts as a selective barrier for diffusion.

<p>Diffusion from underlying connective tissue.</p> Signup and view all the answers

<p>It is richly supplied with nerve fibers.</p> Signup and view all the answers

<p>It is avascular.</p> Signup and view all the answers

<p>Ectoderm, mesoderm, endoderm.</p> Signup and view all the answers

<p>Ectoderm forms the epidermis of skin, endoderm forms the epithelium of the digestive tract, mesoderm forms the serous lining of body cavities.</p> Signup and view all the answers

<p>Covering/lining epithelium, glandular epithelium (endocrine and exocrine), neuroepithelium (taste buds).</p> Signup and view all the answers

<p>The number of layers of cells and the shape of surface cells.</p> Signup and view all the answers

<p>Simple (one layer of cells) and stratified (2 or more layers of cells).</p> Signup and view all the answers

<p>Squamous (flat), cuboidal (square), and columnar (tall).</p> Signup and view all the answers

<p>They are formed of one layer of cells resting on a basement membrane.</p> Signup and view all the answers

<p>Absorption, diffusion, secretion, excretion.</p> Signup and view all the answers

<p>Simple squamous, simple cuboidal, simple columnar, pseudostratified columnar.</p> Signup and view all the answers

<p>Its major function is diffusion; found in Bowman's capsule in kidney, lining of blood vessels, lining of body cavities, and alveoli of lungs.</p> Signup and view all the answers

<p>Absorption, secretion; located in convoluted tubules of kidney, thyroid gland, and germinal epithelium of ovary.</p> Signup and view all the answers

<p>Functions are absorption and secretion; located in the lining of the uterus, uterine tube, stomach, small intestine, large intestine, and gall bladder.</p> Signup and view all the answers

<p>There is one layer of cells where all cells touch the basement membrane, but not all cells reach the luminal surface.</p> Signup and view all the answers

<p>The nuclei appear to be arranged in more than one layer; this is a false appearance.</p> Signup and view all the answers

<p>Pseudostratified columnar ciliated with goblet cells found in the respiratory system; pseudostratified columnar with stereocilia found in the male reproductive system.</p> Signup and view all the answers

<p>Non-motile microvilli.</p> Signup and view all the answers

<p>Protection - they have the ability to withstand wear and tear.</p> Signup and view all the answers

<p>Stratified squamous, stratified cuboidal, stratified columnar, transitional.</p> Signup and view all the answers

<p>Keratinized in the epidermis of skin; non-keratinized in the oral cavity, pharynx, esophagus, vagina, and cornea.</p> Signup and view all the answers

<p>It is only found in the small ducts of sweat glands of the skin and in ovarian follicles.</p> Signup and view all the answers

<p>It is present in the large ducts of the salivary glands, conjunctiva (mucus membrane that lines eyelids), and penile urethra.</p> Signup and view all the answers

<p>A type of stratified epithelium that changes shape; found in the urinary system (calyces of kidney, ureter, urinary bladder, and prostatic urethra).</p> Signup and view all the answers

<p>Relaxed: 4-6 layers with cuboidal surface cells; stretched: appears to have 2-3 layers with cuboidal surface cells.</p> Signup and view all the answers

<p>Tight junction (seal), adherent junctions (strong adhesion), gap junctions (communication), desmosomes (connect cells), hemidesmosomes (connect epithelial cells to connective tissue).</p> Signup and view all the answers

<p>Tonofilaments/intermediate filaments are inserted into plaques on the cytoplasmic surfaces of junctional membranes.</p> Signup and view all the answers

<p>Cilia, microvilli (brush border), stereocilia.</p> Signup and view all the answers

<p>Simple/pseudostratified columnar ciliated epithelium.</p> Signup and view all the answers

<p>Attached to basal bodies, composed of microtubules, found in the respiratory tract and fallopian tubes.</p> Signup and view all the answers

<p>The microvilli-covered surface of simple cuboidal and simple columnar cells; found in small intestine and proximal convoluted tubules of the kidney.</p> Signup and view all the answers

<p>Short folds of cell membrane with a core of actin filaments; increase the surface area for absorption.</p> Signup and view all the answers

<p>Long microvilli that project from the cell; found in male genital passages.</p> Signup and view all the answers

<p>To absorb testicular fluid in the epididymis and vas deferens.</p> Signup and view all the answers

<p>Modified columnar cells that synthesize and secrete mucus; found in the GI tract and respiratory tract.</p> Signup and view all the answers

<p>Unicellular gland.</p> Signup and view all the answers

<p>Cells that contain contractile actin proteins; found in exocrine glands.</p> Signup and view all the answers

<p>An organized collection of cells derived from covering epithelial cells; synthesize, secrete, and store secretion.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>Exocrine (contains ducts) and endocrine (do not have ducts).</p> Signup and view all the answers

<p>Proliferation of surface cells, downward growth into connective tissue, differentiation into exocrine and endocrine.</p> Signup and view all the answers

<p>Glands formed of secretory units that release secretion into a lumen and duct.</p> Signup and view all the answers

<p>Branching of the duct, shape of the secretory unit, type of secretion, method/mode of secretion.</p> Signup and view all the answers

<p>Simple (ducts do not branch) and compound (branched duct system).</p> Signup and view all the answers

<p>Tubular (tube-like) and acinar/alveolar (bulbous-like).</p> Signup and view all the answers

<p>Serous (watery secretion), mucous (thick secretion), mixed (both serous and mucous); e.g., parotid gland (serous), goblet cells (mucous), submandibular gland (mixed).</p> Signup and view all the answers

<p>Eccrine (cell intact), apocrine (apex of cell lost), holocrine (entire cell lost); e.g., sweat glands (eccrine), mammary glands (apocrine), sebaceous glands (holocrine).</p> Signup and view all the answers

<p>By their arrangements.</p> Signup and view all the answers

<p>Follicular (arranged in rings) and anastomosing cords (cells in contact with capillaries); e.g., thyroid gland (follicular), parathyroid gland (anastomosing cords).</p> Signup and view all the answers

<p>Protection (skin, cornea), absorption (intestines, kidney), secretion (glandular epithelium), excretion (kidney), sensation (taste buds), contractility (myoepithelial cells), reproduction (germinal epithelium).</p> Signup and view all the answers