Physiology Alveoli will not collapse during expiration in normal individuals. The stability of alveoli is maintained by the following factor: A Compliance of the lungs B Residual air in alveoli C Negative intrapleural pressure D Reduced surface tension by surfactant 💡 Explanation Alveoli will not collapse during expiration in normal individuals. The stability of alveoli is maintained by the following factor: ✓ Correct Answer: D. Reduced surface tension by surfactant