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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.
(i) To store food efficiently. (ii) To provide maximum strength. (iii) To allow quick exchange of materials across them. (iv) To reduce friction.
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The correct option is (iii) To allow quick exchange of materials across them.
A thin lining lets gases and liquids diffuse across quickly, which is why the lining of the lungs and blood vessels is just one cell thick.
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