Lung Volumes & Capacities Explained | Tidal Volume, VC, TLC, FRC, Spirometry
Learn everything about lung volumes and lung capacities in this complete respiratory physiology lecture. Understand Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV), Residual Volume (RV), and how they combine to form Inspiratory Capacity (IC), Functional Residual Capacity (FRC), Vital Capacity (VC), and Total Lung Capacity (TLC).
This video also breaks down how spirometry, helium dilution technique, and body plethysmography are used to measure lung function, plus how to read a spirometric graph — a must-know topic for medical, nursing, physiotherapy, and allied health students preparing for exams like USMLE, NEET PG, physiology boards, and respiratory therapy courses.
⏱ TIMESTAMPS
0:00 – Introduction
0:27 – What is Lung Volume?
1:09 – Four Primary Lung Volumes Overview
1:31 – Tidal Volume (TV)
2:08 – Inspiratory Reserve Volume (IRV)
2:48 – Expiratory Reserve Volume (ERV)
3:18 – Residual Volume (RV)
4:02 – Introduction to Lung Capacities
4:36 – Inspiratory Capacity (IC)
5:00 – Functional Residual Capacity (FRC)
5:31 – Vital Capacity (VC) & Forced Vital Capacity (FVC)
6:17 – Total Lung Capacity (TLC)
6:51 – How Lung Volumes Are Measured (Spirometry, Helium Dilution, Body Plethysmography)
7:51 – Understanding the Spirometric Graph
9:17 – Conclusion
⚠️ DISCLAIMER
This video is intended for educational purposes only and is meant for students of medicine, nursing, physiology, and allied health sciences. It is not a substitute for professional medical advice, diagnosis, or treatment. Average values mentioned (e.g., Tidal Volume ~500 mL, Vital Capacity ~4600 mL) are approximate and can vary by age, sex, height, and fitness level. Always consult a qualified healthcare provider or pulmonologist for any respiratory health concerns or interpretation of your own lung function tests.
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