Chronic obstructive pulmonary disease (COPD) is a disease of the lungs characterized by breakdown of the alveolar spaces. One of the common symptoms is barrel chest, in which the lungs become hyperinflated due to an inability to push out excess air. A decrease in which of the following lung volumes most contributes to the barrel chest symptom?

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1. Chronic obstructive pulmonary disease (COPD) is a disease of the lungs characterized by breakdown of the alveolar spaces. One of the common symptoms is barrel chest, in which the lungs become hyperinflated due to an inability to push out excess air. A decrease in which of the following lung volumes most contributes to the barrel chest symptom?