
Concept explainers
Transitional epithelium is found is
- a. the urinary system.
- b. the respiratory system.
- c. the
digestive system . - d. the reproductive system.
- e. all of the above.

Introduction:
Epithelial cells are sheet of adhering cells that cover the body surfaces and cavities in the form of internal and external linings of body organs and tissues of glands. The main functions of the epithelial cells are protection, secretion, absorption, excretion, sensation, and filtration. Epithelia consist of three classes: simple (one layer of cells), pseudostratified, and stratified (consists of 2 to 20 layers of cells).
Answer to Problem 1TYR
Correct answer:
Transitional epithelium acts as a leak proof membrane in the urinary tract. Therefore, option a is correct.
Explanation of Solution
Justify reasons for the correct statement:
Transitional epithelia are layer of cells present in the mucosal lining of the urethra. The function of this cell is to permit the distension of the urinary organ by contained urine and it also ensures the leak proof mechanism of the urinary tract.
Option (a) is given as “the urinary system”.
Transitional epithelia are present in the urinary tract and permits the distension of urinary organ.
Hence, option (a) is correct.
Justify reasons for the incorrect statements:
Option (b) is given as “the respiratory system”.
The respiratory system contains the lining of pseudostratified columnar epithelia, which are ciliated and mucus-secreting goblet cells. Hence, it is a wrong answer.
Option (c) is given as “the digestive system”.
The intestinal and gut regions are lined by simple columnar epithelium cells, which involves in the absorption and secretion processes. Hence, it is a wrong answer.
Option (d) is given as “the reproductive system”.
The reproductive system is lined with stratified columnar epithelial cells, which functions in protection and secretion processes. Hence, it is a wrong answer.
Option (e) is given as “all the above”.
Transitional epithelial cells are present in the urinary organs including bladder, urethra, and ureters. Hence, it is a wrong answer.
Hence, options (b), (c), (d), and (e) are incorrect.
In conclusion, transitional epithelia are present in the urinary tracts, which permits the urinary organ to expand and stretch.
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