What is the function of T3 in metabolism?

The primary function of T3, or triiodothyronine, in metabolism is to increase the metabolic rate. T3 is a thyroid hormone that plays a crucial role in regulating various metabolic processes in the body, including the speed at which cells and organs perform their functions. It enhances oxygen consumption, increases the basal metabolic rate, and stimulates the catabolism of macronutrients such as carbohydrates and fats, leading to increased energy production.

T3 influences many metabolic pathways, promoting the synthesis of enzymes involved in metabolism and enhancing the mobilization of energy stores. This hormone ensures that the body can effectively respond to metabolic demands, such as those that occur during exercise or fasting, highlighting its key role in maintaining energy homeostasis.

While stimulating growth and regulating calcium levels are important functions of other hormones in the endocrine system, and inhibiting glucose production can relate to the actions of hormones like insulin or glucagon, T3's specific and recognized role is to elevate the metabolic rate, making it the correct distinction in this context.