50. The Jones\' baby was born 4 weeks prematurely. As a result, the infant was p

Question

50. The Jones' baby was born 4 weeks prematurely. As a result, the infant was placed in an incubator. The physician indicated that while the infant's lungs looked developmentally fine, it was impossible for the lungs to fill with air as they should. One of the most common problems that would result in this condition would be due to: A. an inability of the infant's muscles to increase volume of the lung tissue B. a problem with the Type I cells lining the alveoli C. a problem with the Type II cells lining the alveoli D. inability of the foramen ovale to close

Explanation / Answer

Ans. C

Surfactant is a substance which is secreted by type2 cells which reduce the surface tension and prevent the lung from collapse during expiration usually this forms by 34-36 wks of gestation this is the reason for respiratory distress syndrome in premature babies

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