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Question

Stretchable and water proof epithelium is:
  1. Simple cuboidal
  2. Simple squamous
  3. Simple columnar
  4. Transitional

A
Simple columnar
B
Simple squamous
C
Simple cuboidal
D
Transitional
Solution
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Transitional epithelium is a type of tissue consisting of multiple layers of epithelial cells that contract and expand. This tissue structure type is found in urothelium, including that of the urinary bladder, the ureters and the superior urethra and gland ducts of the prostate. Transitional epithelium is stretchable and waterproof. The cells of transitional epithelium are highly keratinized and contain tight junctions or virtually impenetrable junctions, that seal together the cellular membranes of neighboring cells. This barrier prevents reabsorption of toxic wastes and pathogens by the bloodstream.
Hence the correct option is D.

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