515. An abrasion results in the total loss of epidermis over a large area of an arm, but one month later, the abrasion has healed, with regrowth of the epidermis. Which of the following mechanisms accounts for the restoration of the epidermis over the abraded area?

 A.  Growth of epidermis from hair follicles and sweat glands in the dermis
 B.  Migration of endothelial cells from newly grown capillaries
 C.  Transformation of dermal fibroblasts into epidermal cells
 D.  Transformation of macrophages into epidermal cells
 E.  Transformation of melanocytes into epidermal cells

53. Urothelium does not line:

a) Collecting ducts

b) Minor calyx

c) Ureter

d) Urinary bladder

ANS: A

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19. The epithelium of the mucous membrane of the mouth is:

A. Simple squamous B. Stratified squamous
C. Simple columnar D. Stratified columnar

ANS.B.

Squamous cells are flattened, pancake-like cells, and when in layers are known as stratified. The stratified squamous cells lining the mucosa of the oral cavity are similar to those lining the outer skin, although less keratinized. They do, however, flake off continuously into the mouth. Simple squamous tissue would be too thin and not allow for the constant flaking and replacement. Columnar epithelium is found in both the respiratory system and other organs of the digestive system.

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