I am reading about Inspiratory Reserve Volume and Expiratory Reserve Volume in my textbook. So my general question is aren't the two terms show the same amount of air ?
I would like to tell you why I think so. Like IRV tells us about the maximum amount of air we can intake other than normal intake. So this extra amount is what going inside our lungs and I think this is the part which comes out in the form of ERV .
So shouldn't the total capacity of lungs be equal to (Tidal volume + IRV + Reserved Volume) only ? Why do we need to include the term ERV in the above equation ?