Final answer:
Thyroxine (T4) and triiodothyronine (T3) are the main thyroid hormones that control metabolism rates.
Explanation:
Thyroxine (T4) and triiodothyronine (T3) are the primary thyroid hormones that regulate the rate of metabolism. These hormones affect almost every cell in the body except a few, activating genes involved in energy production and glucose oxidation, leading to increased rates of metabolism and body heat production.
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