Which of the following substances is a major factor that influences a person's metabolic rate?

Question

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Thyroid hormone plays a major role in regulating metabolism. It stimulates the production of ATP, the body's energy currency, and influences the rate at which the body uses energy. Changes in thyroid hormone levels can cause shifts in metabolic rate, leading to weight gain or loss. Leptin, ghrelin, and salivary amylase are also involved in metabolism and appetite regulation, but they are not as significant in influencing metabolic rate as thyroid hormone.

Which of the Following Substances Is a Major Factor That