Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

Thyroxine is a hormone produced by which gland?

1. Adrenal gland

2. Thyroid gland

3. Pituitary gland

4. Pancreas

The correct answer is: Thyroid gland

Thyroxine, also known as T4, is a hormone that is primarily produced by the thyroid gland, which is located in the neck. This hormone plays a crucial role in regulating metabolism, heart rate, and body temperature, among other physiological functions. The thyroid gland synthesizes thyroxine from iodine and the amino acid tyrosine, and its release is primarily regulated by the thyroid-stimulating hormone (TSH) produced by the pituitary gland. Recognizing the specific gland responsible for producing thyroxine is important in understanding endocrine function and hormonal balance within the body. The adrenal gland, on the other hand, produces hormones related to stress response and metabolism, such as cortisol and adrenaline. The pituitary gland is often referred to as the "master gland" because it regulates other endocrine glands but does not produce thyroxine itself. The pancreas is involved in digestive and metabolic functions, primarily through the production of insulin and glucagon, not thyroxine. Thus, understanding these distinctions helps clarify the specific role of the thyroid gland in hormonal regulation and the overall endocrine system.