In the context of pediatric patients with cystic fibrosis, surfactant plays several important roles in the respiratory system. All of the following are functions of surfactant, except:
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BProviding defense against microorganism infection
CVasodilating the pulmonary vasculature
DReducing surface tension to prevent alveolar collapse
✓ Correct answer: C. Vasodilating the pulmonary vasculatureAnswer: Vasodilating the pulmonary vasculature Surfactant, while aiding in respiratory functions like reducing surface tension to prevent alveolar collapse and contributing to defense against infections, does not have a vasodilating effect on the pulmonary vasculature. Patients with cystic fibrosis may benefit from surfactant's ability to support lung function, but not in expanding blood vessels. In cystic fibrosis, the thick mucus obstructs the airways, so surfactant can aid in mucociliary clearance but it is not involved in vasodilation.
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Theory