Physiology True about normal expiration A At the end of normal expiration air in lung is ERV B Chest wall has a tendency to move outward which is balanced by inward recoil of alveoli C In expiration pleural pressure is equal to alveolar pressure D Muscles that elevate the chest cage are classified as muscles of expiration 💡 Explanation True about normal expiration ✓ Correct Answer: A. At the end of normal expiration air in lung is ERV