Physiology True regarding physiology of surfactant is A SP-A & SP- D are hydrophobic & SP-B & SP- D are hydrophilic B Secreted into alveolar lumen as tubular myelin C SP-A plays a major role in innate host defense of the lung D Pulmonary surfactant is composed of 80% lipids and 20% proteins. 💡 Explanation True regarding physiology of surfactant is ✓ Correct Answer: C. SP-A plays a major role in innate host defense of the lung