Figure 2 H&E of heart sections of gallic acid/ISO-treated rats. Rats received gallic acid 15 mg/kg/day orally for 10 days followed by a subcutaneous dose of isoprenaline 100 mg/kg/day for 2 days. Animals were sacrificed and the heart was removed and processed for histopathological examination. Rats received gallic acid and ISO show mild muscle congestion (a; arrows) and normal myofibers (b). (c) shows heart section of control untreated rat with normal striation of the myocardium.