Laser Technician IBEC Board Exam 2025 – 400 Free Practice Questions to Pass the Exam

Thyroxine, also known as T4, is a hormone produced by the thyroid gland that is crucial for regulating metabolism throughout the body. It influences the metabolic rate, which affects how the body uses energy and how fast it burns calories. T4 helps to control the speed of cellular processes and is essential for growth, development, and the maintenance of normal physiological function.

This hormone is synthesized from the amino acid tyrosine and iodide and is released into the bloodstream, where it travels to various organs and tissues. The levels of thyroxine in the blood can affect numerous bodily functions, including heart rate, temperature regulation, and even mental health.

Thyroxine exerts its metabolic effects by promoting the production of proteins and increasing the body's metabolic rate when needed. This regulation is vital for maintaining energy balance and overall health. The other hormones listed, such as insulin and estrogen, perform different roles in the body, and while cortisol is involved in stress response and metabolism, it does not directly regulate metabolic rate in the same way that T4 does.