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T3 (triiodothyronine) and T4 (thyroxine) are crucial hormones produced by the thyroid gland, and they play a significant role in regulating the body's metabolism. These hormones enhance the metabolic rate of almost every tissue in the body, leading to increased energy production and consumption. They stimulate the process by which the body converts dietary calories into energy and is vital in maintaining overall metabolic processes, such as the breakdown of carbohydrates, fats, and proteins.
T3 is the more active form of the hormone, while T4 is a prohormone that is converted into T3 in target tissues. The increase in metabolic processes affects various bodily functions, including heart rate, body temperature regulation, and even the efficiency of muscle contractions and digestion.
While other functions mentioned in the choices, such as regulating body temperature and stimulating digestion, can be influenced by thyroid hormones, the primary and most direct role of T3 and T4 is to stimulate and maintain metabolic processes in the body.