What is the primary function of the thyroid hormones like thyroxine?

The primary function of thyroid hormones, particularly thyroxine (T4), is to control metabolic rate. Thyroxine plays a crucial role in regulating how the body uses energy by influencing the speed at which cells convert oxygen and calories into energy. It affects the metabolism of carbohydrates, fats, and proteins, thereby influencing overall energy expenditure and weight management.

The thyroid hormones increase the body's basal metabolic rate, which is the rate at which energy is expended while at rest, and they facilitate the regulation of various bodily processes, including growth, development, and temperature regulation. By controlling metabolic rate, these hormones are vital for proper physiological functioning and maintaining homeostasis within the body.