An important histologic characteristic of the distal smallintestine (ileum) is the
A. absence of villi from the luminal surface
B. concentration of outer smooth muscle layer into bands
C. aggregation of lymphatic nodules in the mucosa and submucosa
D. presence of submucosal glands that drain into the crypts of Lieberkuhn
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Which of the following descriptions correctly characterizesthe mucosal epithelium of the human esophagus?
A. Pseudostratified columanar
B. Nonkeratinized stratified squamous
C. Simple columnar
D. Keratinized stratifiedsquamous
E. Stratified cuboidal
The muscularis externa of the human esophagus differs from that of the rest of the alimentary canal because it
A. contains only a single thick layer of smooth muscle
B. is continuous with the muscularis mucosae with no intervening submucosa
C. contains exclusively striated muscle in the upper one-third of the esophagus
D. forms three distinct longitudinal bands on the outside of the esophagus
E. contains three distinct layers of smooth muscle in an orthogonal array
A histologic section of the intestine shows branched tubular glands in the compartment bounded by the muscularis mucosae and the muscularis externa. The glands drain into the crypts of lieberkuhn. This is a section of
A. pylorus
B. cecum
C. ileum
D. jejunum
E. duodenum
The replicative zone of the gastric epithelium is located in the
A. base of the gastric gland, with all differentiating cells migrating toward the stomach lumen
B. neck of the gastric gland, with all differentiating cellsmoving toward the base of the gland
C. surface epithelium, with all differentiating cells moving toward the base of the gland
D. neck of the gland, toward the surface of the gland, and some moving toward the base
E. base of the sbumucosal glands, with all differentiating cells moving through the full thickness of the mucosa to the surface
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