Lung Capacities | Vital, Inspiratory, Functional Residual & Total Lung Capacity Made Easy

What are lung capacities and how are they measured? In this medical lecture, we explain all the four main lung capacities — Vital Capacity (VC), Inspiratory Capacity (IC), Functional Residual Capacity (FRC), and Total Lung Capacity (TLC) — in a clear and easy way with examples and formulas. 📚 In this video, you’ll learn: What are Lung Capacities? • Combinations of two or more lung volumes • Represent the total air the lungs can hold at different breathing stages • Important for assessing lung function in tests like spirometry and PFTs (Pulmonary Function Tests) 🔹 1. Vital Capacity (VC) • Maximum air exhaled after a deep inhalation • Formula: VC = TV + IRV + ERV • Normal value ≈ 4700 mL • Indicates strength of respiratory muscles 🔹 2. Inspiratory Capacity (IC) • Maximum air inhaled after a normal exhalation • Formula: IC = TV + IRV • Normal value ≈ 3700 mL 🔹 3. Functional Residual Capacity (FRC) • Air remaining in lungs after normal exhalation • Formula: FRC = ERV + RV • Normal value ≈ 2200 mL • Prevents alveolar collapse 🔹 4. Total Lung Capacity (TLC) • Total amount of air lungs can hold after full inhalation • Formula: TLC = TV + IRV + ERV + RV • Normal value ≈ 6000 mL (6 liters) • Represents complete lung inflation capacity 💡 Clinical Importance: Used in diagnosing COPD, asthma, restrictive lung diseases, and emphysema Helps evaluate lung elasticity and ventilation efficiency 🎯 Who should watch this video: Medical, nursing, physiotherapy, and respiratory therapy students MBBS, USMLE, PLAB, FCPS, NEET-PG aspirants Anyone curious about how the lungs store and move air lung capacities, vital capacity, inspiratory capacity, functional residual capacity, total lung capacity, lung capacity explained, pulmonary function test, spirometry, lung volume and capacity, respiratory physiology, breathing capacity, total lung volume, normal lung values, mbbs physiology, usmle respiratory, neet pg physiology, plab respiratory, respiratory lecture #LungCapacity #RespiratoryPhysiology #MedicalLecture #MBBS #USMLE #Spirometry #Breathing #PhysiologyLecture #PulmonaryFunction #RespiratorySystem Disclaimer: The information presented here has been compiled from various publicly available sources, all of which are cited above. Every effort has been made to respect copyright and intellectual property rights. If any content has been used inappropriately or without proper attribution, it is entirely unintentional. Please feel free to reach out if you believe any material requires correction, removal, or proper credit — I will address it promptly.