While observing the epithelial lining of the alimentary canal, a student notes the presence of isolated secretory cells interspersed among the regular epithelial cells. Identify these cells and their correct glandular classification.

Step-by-step solution

According to NCERT, some of the columnar or cuboidal cells get specialised for secretion and are called glandular epithelium. They are mainly of two types: unicellular, consisting of isolated glandular cells (e.g., goblet cells of the alimentary canal), and multicellular, consisting of clusters of cells (e.g., salivary glands). Goblet cells secrete mucus, which is released through ducts or tubes, making them exocrine glands. Endocrine glands, on the other hand, are ductless and secrete hormones. Therefore, the isol