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Tons of atp in these cells so lots of mitochondria way

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Unformatted text preview: a flap/propeller! Fig. 4-11 The axoneme is organized by the basal body which resembles a centriole, having 9 MT triplets and none in the center. tons of ATP in these cells, so lots of mitochondria -- way more than wimpy microvilli. Epithelia are classified and named histologically based on the number of cell layers (simple vs. stratified) and cell shape. Simple squamous epithelium Simple cuboidal epithelium THICKER, BOX-LIKE FLAT, WIDE, THIN Figs. 4-12 & 13 Simple columnar epithelium TALLER THAN THEY ARE WIDE! Fig. 4-14 (trachea!!!) Pseudostratified epithelium Diff cell types w/ nuclei @ diff levels -APPEARS stratified but not really! Fig. 4-17 Tall epithelium cells can be simple (usually specialized for absorption or secretion) or “pseudostratified” (nuclei not aligned). Pseudostratified epithelia usually include cells with cilia and are found mainly in the lining of the respiratory tract. Stratified epithelia have 2 or more cell layers on the basement membrane and are named according to the shape of the surface cells. The most common, stratified squamous epithelium, may have the surface cells keratinized (a) with the nuclei lost, (in the case of EPIDERMIS) or “nonkeratinized” (b, c). A bunch of diff layers!!! As you move up from basement membrane, they start to get FLATTER and thus more SQUAMOUS. Fig. 4-15 stratified cuboidal epithelium Another specialized epithelial type is transitional epithelium or urothelium , which is found only in the lining of the urinary bladder and ureters. It is protective and “stretches” as the bladder fills. (Discussed later with the urinary system.) Protective against urine! Fig. 4-16...
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