MICROANATOMY

Detailed explanation-1: -Simple squamous epithelium lines air sac or alveoli. These squamous epithelial cells are permeable and allow the oxygen from the air to enter the blood in the capillaries of the lung, So, the correct answer is option ‘Squamous epithelium’.

Detailed explanation-2: -Squamous, or flattened, epithelial cells, very thin and irregular in outline, occur as the covering epithelium of the alveoli of the lung and of the glomeruli and capsule of the kidney.

Detailed explanation-3: -Simple squamous epithelium: This type of epithelium typically lines blood vessels and body cavities and regulates the passage of substances into the underlying tissue.