A) protective sheath
B) reproductive structures
C) corpuscle
D) nerve cells
Correct Answer: A
Solution :
The term epithelium was first introduced by the Dutch anatomist Ruysch in 18th centuray. Epithelium is composed of one or more layers of cells, which is present as the lining of external and internal exposed parts of the body and in various organs. It has triplet origin, ie, form from ectoderm (eg, skin epidermis), mesoderm (eg, peritoneum) and endodenn (eg, gut epithelium). Generalized protections the most important function of membranom epithelium. It is the relatively tough and important impermeable epithelial covering of the skin that protects the body from mechanical and chemical injuries. Epithelia are classified on the basis of the arrangements and shapes of their cells. Classifications are as follows
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