TG and hyperthyroidism: We find that such a ratio (89.94 ± 3.01, 83.49 ± 9.33, 78.51 ± 3.37, and 85.92 ± 3.34 for C, Cs, T3, and T3S, respectively) is not changed by the thyroid hormone treatment, according to previous observations showing that, in experimental hyperthyroidism, the increase in hepatic respiration involves increases in the number of respiratory chain proteins and inner surface area of the mitochondria [40] without changes in their number [41] and protein mass [42].