Mr. s. is a retired 69-year-old county attorney who was on a buying trip with his wife looking for old, classic cars in the high, mountainous country of colorado when he became extremely short of breath. his alarmed wife took him to a mul­tispecialty medical clinic for evaluation. on admission to the clinic, mr. s. was restless and dyspneic. his chest had an increased anteroposterior dimension. his past history revealed a habit of smoking two packs of cigarettes a day for 45 years. during the past few years, mr. s. noticed a cough each morning on arising. recently, while working in his flower garden, he had to stop at times to catch his breath. even while watching television, he had experienced dyspnea. a chest radiograph was taken, and pulmonary function tests were done. the chest radiograph revealed a flat, low di­aphragm with lung hyperinflation but clear fields. pulmonary function tests showed decreased tidal volume and vital ca­pacity, increased total lung capacity, and prolonged forced expiratory volume. which pulmonary disease is exhibited by mr. s.’s symptoms? justify your answer and explain the mechanisms behind the manifestations?