Which of the following hormones is NOT secreted by the thyroid gland?

The hormone that is not secreted by the thyroid gland is cortisol. This is because cortisol is produced by the adrenal glands, which are located on top of the kidneys. It plays a crucial role in the body’s response to stress, metabolism regulation, and immune response.

In contrast, the thyroid gland is responsible for the synthesis and secretion of hormones that are essential for metabolism and development. Thyroxine (T4) and triiodothyronine (T3) are the primary hormones produced by the thyroid, both of which are vital in regulating metabolic processes. Calcitonin is also secreted by the thyroid gland, specifically by the parafollicular cells (C cells), and it helps regulate calcium levels in the blood.

Therefore, the identification of cortisol as the hormone not produced by the thyroid gland highlights its distinction from the hormones that are indeed synthesized by the thyroid.