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Goblet cells of alimentary canal are modified from:
The lining of the stomach and intestine is composed of tall, slender Columnar epithelial cells. Some of these columnar cells specialize for secretion of mucus and are termed Goblet cells (unicellular glandular epithelium). Mark Columnar epithelial cells (Option 2) in 5 seconds!
Some of the columnar or cuboidal cells get specialized for secretion and are called glandular epithelium. They are mainly of two types: unicellular, consisting of isolated glandular cells (goblet cells of the alimentary canal), and multicellular, consisting of cluster of cells (salivary glands).
In the mucosal lining of the gastrointestinal tract (stomach, small intestine, colon), goblet cells are interspersed among tall absorptive enterocytes and are direct modifications of columnar epithelial cells.
Goblet cells synthesize and secrete mucin glycoproteins that form a protective lubricating mucus barrier over the mucosal surface, shielding epithelial cells from digestive enzymes and low pH.
Squamous epithelium lines blood vessels and air sacs; chondrocytes are cartilage cells; compound epithelium forms multi-layered protective skin. Only columnar epithelial cells differentiate into intestinal goblet cells.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; squamous cells are flat, scale-like cells functioning in diffusion and filtration (e.g. alveoli, endothelium), not mucus secretion.
Factually exact; goblet cells are modified tall columnar epithelial cells specialized for mucus secretion.
Incorrect; chondrocytes are mature cartilage-forming connective tissue cells, completely unrelated to gut mucosal epithelium.
Incorrect; compound epithelium is multi-layered with limited secretory role (providing protection against mechanical and chemical stress).
Unicellular glands = Isolated GOBLET CELLS (modified columnar cells). Multicellular glands = SALIVARY GLANDS (clustered cells).
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