Chapter 17: Breathing and Exchange of Gases – Part 4
✅ Chapter 17: Breathing and Exchange of Gases – Part 4 🔬 Respiratory Volumes, Capacities, and Transport of Gases 🧪 Respiratory Volumes: These are the measurements of air movement during different phases of breathing. Let’s understand each volume in detail: Volume Definition Average Value Tidal Volume (TV) Volume of air inspired or expired during normal breathing ~500 mL Inspiratory Reserve Volume (IRV) Additional air inspired with force after normal inspiration ~2500–3000 mL Expiratory Reserve Volume (ERV) Additional air expired forcefully after normal expiration ~1000–1100 mL Residual Volume (RV) Air remaining in lungs even after forced expiration ~1100–1200 mL ✅ Key point: Residual Volume prevents lung collapse . 🧪 Respiratory Capacities: These are combinations of two or more volumes. Capacity Formula Average Value Inspiratory Capacity (IC) TV + IRV 3000–3500 mL Expiratory Capacity (EC) TV + ERV 1500–1600 mL Functio...