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Why the bronchioles and lungs in human beings do not collapse even though they lack the cartilaginous rings?
(a) Surfactants secreted by the clara cells prevent the collapse
(b) The intercostal muscles keep the pleura expanded
(c) The elastic cartilage present on their surface prevents them from collapsing
(d) None of the above
Why the bronchioles and lungs in human beings do not collapse even though they lack the cartilaginous rings?
(a) Surfactants secreted by the clara cells prevent the collapse
(b) The intercostal muscles keep the pleura expanded
(c) The elastic cartilage present on their surface prevents them from collapsing
(d) None of the above
Answer is : (a) Surfactants secreted by the clara cells prevent the collapse
Pulmonary surfactant is a mixture of lipids and proteins which is secreted by the epithelial cells, viz. clara cells. Its main function is to reduce surface tension, thereby preventing the bronchioles and the lungs from collapsing.