Definition / Explanation: $(1)$ Alveoli
(N/A) Alveoli are the primary sites of gaseous exchange in the lungs. Each alveolus forms a bag-like or cavity-like structure,which is surrounded by a network of very thin pulmonary capillaries. The wall of the alveolus is composed of a single layer of squamous epithelial cells,which facilitates the diffusion of gases ($O_2$ and $CO_2$) between the air and the blood.
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Identify the component of the respiratory system which displays the features given below and choose the correct option:
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with the thoracic wall
$IV.$ Its inner layer is in contact with the lungs
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with the thoracic wall
$IV.$ Its inner layer is in contact with the lungs
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