Which gland is primarily responsible for regulating metabolism through the secretion of thyroxine (\(T_4\)) and triiodothyronine (\(T_3\))?

• A. Thyroid gland
• B. Adrenal gland
• C. Pituitary gland
• D. Pancreas

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the role of metabolism regulation in the body. Metabolism refers to the chemical processes that occur within a living organism to maintain life, including energy production and utilization.
2. Step 2: Learn about the hormones thyroxine (\(T_4\)) and triiodothyronine (\(T_3\)). These hormones are critical for regulating the body's metabolic rate, heart function, digestive function, and overall energy balance.
3. Step 3: Identify the gland responsible for secreting \(T_4\) and \(T_3\). The thyroid gland, located in the neck, is primarily responsible for producing and releasing these hormones into the bloodstream.
4. Step 4: Differentiate the thyroid gland from other glands listed in the options. For example, the adrenal gland secretes hormones like cortisol and adrenaline, the pituitary gland regulates other glands through hormones like growth hormone and ACTH, and the pancreas produces insulin and glucagon for blood sugar regulation.
5. Step 5: Confirm that the thyroid gland is the correct answer based on its specific role in metabolism regulation through the secretion of \(T_4\) and \(T_3\).