Question

What are the glands referred to as when secretory granules leave cells by exocytosis with no loss of other cellular material
A. Merocrine
B. Holocrine
C. Autocrine
D. Apocrine

Answer 1

Hint:
Secretory granules are specialised intracellular organelles that function as a storage pool for selected secretory products. The exocytosis of secretory granules is markedly amplified under physiologically stimulated conditions. Secretory granules function as storage compartments for secretory products and are the most important organelles involved in regulated secretion. In the regulated secretory pathway, secretory granules store peptide hormones that are released on demand.

Complete answer:
Protein hormones are made in large amounts in neuroendocrine cells and are stored in large dense-core vesicles full of protein. They are commonly referred to as secretory granules. Sorting of secreted proteins into dense-core secretory granules may involve selective aggregation of regulated secretory proteins instead of a conventional sortase. Synaptic vesicles that mediate paracrine communication between adjacent cells appear to arise by a modification of the first endosome pathway. Regulated secretion of stored secretory products is vital in many cell types.
Hence, the correct answer is Mérocrine.

Option ‘A’ is correct

Note:
For example, the secretory vesicle may be a vesicle that mediates the vesicular transport of cargo. Hormones or neurotransmitters are released from organelles and transported to specific sites on the cell wall where they dock and fuse to release their contents. Neutrophils have a minimum of three distinct granule subsets: primary or azurophilic granules, which contain potent hydrolytic enzymes and myeloperoxidase; secondary and specific granules, which contain high levels of the iron-binding protein lactoferrin; and tertiary or gelatinase.