Question

The basal metabolic rate (BMR) in body cells is regulated by

• A. Parathyroid
• B. Thyroid
• C. Pituitary
• D. Thymus

Answer 1

Answer: (B)

Thyroid

The primary organ responsible for regulating metabolism is the hypothalamus. An individual's basal metabolic rate is highly regulated by the thyroid gland through the secretion of thyroid hormone (TH). TH is used to refer to two similar molecules, thyroxin ($T_4$) and triiodothyronine ($T_3$). The thyroids secretion of TH is in turn regulated by the body's concentration of thyroid stimulating hormone (TSH) as part of a negative feedback loop with the hypothalamus.