Question

Consider the following statements:
(i) Goblet cells are the unicellular glands.
(ii) The products of exocrine glands are hormones and are secreted directly into the fluid bathing the gland.
(iii) Some of the squamous cells get specialized for secretion and are called glandular epithelium.
(iv) Compound epithelium is made of more than one layer of cells and thus has a limited role in secretion and absorption.
Which of the above statements are correct?

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i) and (iv)

Answer 1

Answer: (D)

GLANDULAR EPITHELIUM: This epithelium is composed of either columnar or cuboidal cells.
(1) Exocrine Glands: A gland with duct is called an exocrine gland (Exo = outside, krinein=to secrete). The exocrine gland either send their secretions through ducts to the sites of action or pour their secretions on the epithelial surface directly. The gastric glands, intestinal glands, salivary glands, sweat glands, mammary glands, oil glands, tear glands, etc. are some examples of the exocrine glands. The exocrine glands associated with the gut or alimentary canal generally produces enzymes.
(2) Endocrine Glands: Glands without ducts are called endocrine (endo=inside; krinein=to secrete) or ductless glands. They pour their secretions directly into the bloodstream the endocrine gland secrete regulatory substances called hormones which reach the respective site of action called target organs, though stream. Pituitary, thyroid, parathyroid, thymus, adrenal glands, etc., are some examples of endocrine glands.