What is the primary role of thyroxine during pregnancy?

• A. It decreases insulin sensitivity.
• B. It stimulates basal metabolic rate.
• C. It regulates calcium levels.
• D. It promotes uterine contractions.

Answer: (B)

The primary role of thyroxine during pregnancy is to stimulate the basal metabolic rate. Thyroxine, a hormone produced by the thyroid gland, is crucial for regulating metabolism and energy expenditure. During pregnancy, hormone levels and metabolic demands increase significantly to support fetal growth and development. An elevated metabolic rate promotes efficient energy utilization, contributing to the increased caloric needs of both the mother and the developing baby.

Thyroxine's role in enhancing basal metabolic rate ensures that there is sufficient energy available for the myriad physiological changes that occur during pregnancy, including the development of the placenta and fetal tissues, as well as the physiological changes in the mother's body. By facilitating these processes, thyroxine supports overall health and development throughout gestation.