Breathing and Exchange of GasesHard

Question

The alveolar epithelium in the lung is

Options

A.non-ciliated columnar
B.non-ciliated squamous
C.ciliated columnar
D.ciliated squamous

Solution

The wall of alveoli is highly vascularized. It is surrounded by flattened, non-ciliated squamous cells to increase the surface area. Simple columnar ciliated cells line the few portions of upper respir atory tract, oviduct, fallopian tube and neurocoel of CNS, whereas non-ciliated columnar epithelium lines stomach, intestine, digestive glands and gall bladder.

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