The<unk>  is one of the largest endocrine<unk> s in the body. This<unk>  is found in the neck just below the Adam's apple. The<unk>  controls how quickly the body burns energy, makes proteins, and how sensitive the body should be to other hormones.
The<unk>  participates in these processes by producing<unk>  hormones, principally thyroxine (T4) and triiodothyronine (T3). These hormones regulate the rate of metabolism and affect the growth and rate of function of many other systems in the body. Iodine is an essential component of both T3 and T4. The<unk>  also produces the hormone calcitonin, which plays a role in calcium homeostasis.
The<unk>  is controlled by the hypothalamus and pituitary. The<unk>  gets its name from the Greek word for "shield", after its shape, a double-lobed structure. Hyperthyroidism (overactive<unk>  and hypothyroidism (underactive<unk>  are the most common problems of the<unk> . Specialists are called<unk> ologists.
Thyroid gland
Parathyroid gland
Heart
Gonad
Breast
Sex organ
Lingual thyroid
Central nervous system