Q. Which of the following is/are correctly matched?

1. Squamous epithelium- in cells lining blood vessels or lung alveoli
2. Columnar epithelium- the inner lining of the intestine
3. Cuboidal epithelium- the lining of kidney tubule
4. Glandular epithelium- oesophagus

Select the correct answer from the codes given below:
Answer: Only 1, 2, and 3
Notes: Different epithelia show differing structures that correlate with their unique functions. For example, in cells lining blood vessels or lung alveoli, where transportation of substances occurs through a selectively permeable surface, there is a simple flat kind of epithelium. This is called the simple squamous epithelium (squama means scale of skin). Simple squamous epithelial cells are extremely thin and flat and form a delicate lining. The oesophagus and the lining of the mouth are also covered with squamous epithelium. The skin, which protects the body, is also made of squamous epithelium. Where absorption and secretion occur, as in the inner lining of the intestine, tall epithelial cells are present. This columnar (meaning ‘pillar-like’) epithelium facilitates movement across the epithelial barrier. Cuboidal epithelium (with cube-shaped cells) forms the lining of kidney tubules and ducts of salivary glands, where it provides mechanical support. Sometimes a portion of the epithelial tissue folds inward, and a multicellular gland is formed. This is glandular epithelium.