The ____________ is the amount of air remaining in the lungs after a forced expiration. The volume of air exchanged during normal breathing is called the ____________ . After a normal inspiration, the amount of air that can then be inspired forcefully is called the ____________ . If you subtract the residual volume from the total lung capacity, you get the ____________ . The vital capacity minus the ____________ equals the inspiratory capacity. The effects of obstructive diseases such as asthma or emphysema may be determined by measuring the ____________ .