epithelial tissues that line an animal’s internal organs – Discussion Forum

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Virat

Asked: May 9, 2026In: Class 9 Science

Why are the epithelial tissues that line an animal’s internal organs usually only one or a few cells thick? (i) To store food efficiently. (ii) To provide maximum strength. (iii) To allow quick exchange of materials across them. (iv) To reduce friction.

The correct option is (iii). Epithelial tissues are thin to allow rapid exchange of gases, nutrients and wastes across them. Their thin structure supports efficient absorption, secretion and diffusion in organs like lungs, intestines and blood vessels.