Types of epithelial tissueउपकला ऊतक के प्रकार

NCERT Fig 3.11 · interactive diagram

Parts and their functions

• Exchange — thin flat cells (विनिमय — पतली चपटी कोशिकाएँ) — Single layer of thin, flat cells for rapid diffusion of gases and liquids; lines blood vessels and lungs.
• Protection — many layers (सुरक्षा — अनेक परतें) — Many layers, outer cells flat and tightly packed; protects from injury, friction and microbes — skin, mouth, oesophagus.
• Secretion — gland cells (स्रावण — ग्रंथि कोशिकाएँ) — Cuboidal or columnar cells that make and release mucus, enzymes, hormones, sweat, saliva — salivary and sweat glands, stomach lining.
• Sensory — receptor cells (संवेदी — ग्राही कोशिकाएँ) — Specialised receptor cells with hair-like cilia for smell, taste, sound and balance — nostrils, taste buds, inner ear.
• Absorption — tall cells (अवशोषण — लंबी कोशिकाएँ) — Single layer of tall, pillar-like cells, often with hair-like structures to increase surface; lines the small intestine.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 3.11. Report a mistake