SELF-ASSESSMENT IN HISTOLOGY QUESTIONS 四,EPITHELIAL TISSUES
1 Epithelial tissues line most body cavities and tracts and are also specialised to form glands.(T)
2 Epithelial tissues are solely derived from the ectodermal layer of the embryo.(F)
3 Simple epithelia are defined as surface epithelia composed of a single layer of cells.(T)
4 Mesothelium is the term applied to the epithelial lining of joint cavities.(F)
5 The endothelial lining of blood vessels is derived from endoderm.(F)
6 Simple squamous epithelium is well adaped for exchange of metabolites between different biological compartments.(T)
7 Simple squamous epithelium does noot rest on a basement membrane.(F)
8 Simple cuboidal epothelium is well adapted to provide surface protection from mechanical stresses and is not usually involved in absorption or secretory functions.(F)
9 Simple columnar epithelium forms the lining of the small intestine.(T)
10 Pseudostratified epithelium is mainly confined to the respiratory and male reproductive tracts in humans.(T)
11 Stratified epithelia are defined as surface epithelia consisting of ten or more layers of cells.(F)
12 The oral cavity is lined by stratified cuboidal epithelium.(F)
13 Stratified squamous non- keratinised epithelium may undergo keratinisation when exposed to certain excessive environmental stresses such as drying or friction.(T)
14 Transitional epothelium is mainly found at junctions of the skin with the linings of body tracts such as the gastro-intestinal tract.(F)
15 Cilia are never found at the surface of stratified epithelia.(T)
16 Basement membranes mainly consist of a single layer of extremely flattened cells of connective tissue origin.(F)
17 Basement membranes can be demonstrated by the PAS method which stains proteoglycans a magenta colour.(T)
18 Cilia are usually about the same length as microvilli but the latter are much smaller in diameter and much more numerous.(F)
19 The axoneme of each cilium contains 20 microtubules arranged as nine doublets surrounding a central pair.(T)
20 Cilia constitute the characteristic brush border of the small and large intestines.(F)
21 The principal function of microvilli is to increase greatly the surface area of cells.(T)
22 Microvilli receive structural support from fine filamentous extensions of the cytoskeleton.(T)
23 Stereocilia are an extremely long form of microvilli.(T)
24 Junctional complexes are found at numerous sites between epithelial cells and their underlying basement membranes.(F)
25 Desmosomes are sites of strong intercellular adhesion and provide points of attachment for elements of the cytoskeleton.(T)
26 Exocrine glands are defined as compound glands when the excretory ducts are branched.(T)
27 Sweat glands are an example of compound tubular glands.(F)
28 Acinar glands are defined as those which produce a protein rich secretion.(F)
29 Apocrine secretion is another term for holocrine secretion.(F)
30 Endocrine glands have no ducts and discharge their secretory products into the circulatory system.(T)
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