What role does thyroxine (T4) play in the body?

Thyroxine (T4) is a crucial hormone produced by the thyroid gland that primarily regulates metabolism and energy levels in the body. It plays a significant role in the overall metabolic rate, influencing how quickly the body uses energy from nutrients. T4 increases the basal metabolic rate, enhances the rate of protein synthesis, and is responsible for the metabolism of fats and carbohydrates, allowing cells to generate energy efficiently.

In addition to its metabolic functions, T4 also influences growth and development, particularly in infants and children, by promoting proper development of the brain and other organs. The regulation of metabolism by thyroxine is essential for maintaining healthy body weight, temperature, and overall energy balance, which reflects its key role in energy production and utilization within the body.