Anatomy Respiratory system 75fd5ddb ARDS is due to a defect in: A Type I pnemocytes B Type2 pnemocytes C Clara cells D Endothelial cells High-Yield Explanation ARDS is intiated by injury of pnemocytes and pulmonary endothelium setting in motion a viscious cycle of increasing inflammation and pulmonary damage.(ref Robbins 9th/672)