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Histological modification of lung tissue in hematoxylin and eosin (H&E) stain (40×). (a) control group, (b) exercise-training (ET) group, (c) exercise-training and ascorbic acid group (ET+Aa), and (d) exercise-training and silymarin group (ET+Sm). AS, alveolar space; RC, red cells; T1P, type 1 pneumocytes; T2P, type 2 pneumocytes; Br, bronchiole; BSM, bronchial smooth muscle; Bv, blood vessel; L, lymphocytes; I, inflammation.
