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The active component that primarily influences the speed of the metabolic rate is the basal metabolic rate (BMR), which is determined by factors such as age, sex, body composition, and hormonal levels. The thyroid hormones, particularly thyroxine (T4) and triiodothyronine (T3), play a crucial role in regulating metabolism by affecting how efficiently the body uses energy. Additionally, physical activity and muscle mass can significantly boost metabolic rate, as muscle tissue burns more calories than fat tissue at rest.

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