Give an account of glandular epithelium.

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Detailed Solution

Cuboidal cells (or) columnar cells specialised for secretions form glandular epithelium.

Based on number of cells present, they are of 2 types:
i) Unicellular glands - Eg : Goblet cells of gut that secrete mucus
ii) Multicellular glands - Eg : Salivary glands
Based on mode of secretions, they are 2 types:
a) Exocrine glands/Duct glands : Secrete mucus, saliva, milk etc. out onto body surfaces.
Eg: Salivary glands
b) Endocrine glands/Ductless glands : Secrete hormones into blood. Eg : Thyroid gland
Based on release of secretion, they are three types as shown below: