Question

Which glands secrete hormones directly into the blood stream?

• A. Endocrine glands
• B. Apocrine gland
• C. Merocrine gland
• D. none of the above

Answer 1

Answer: (A), (C), (D)

The correct options are
A

Endocrine glands

C

Merocrine gland

D

none of the above

Exocrine glands are duct glands i.e;these glands are provided with ducts to transport their secretions.Eg:-salivary glands,pancres etc; Whereas Endocrine glands are ductless glands i.e;they release their secretions directly into blood stream. Secretory cells of exocrine glands release their products into ducts in three different ways. The mode of secretion can be classified as merocrine, apocrine, or holocrine. In the apocrine method, the apical portions of cells are pinched off and lost during the secretory process. This results in a secretory product that contains a variety of molecular components including those of the membrane. Mammary glands release their products in this manner. Cells that secrete products via the merocrine method form membrane-bound secretory vesicles internal to the cell. These are moved to the apical surface where the vesicles coalesce with the membrane on the apical surface to release the product. So apocrine glands and mecocrine are also exocrine gland.