| T3 | A thyroid hormone, also known as triiodothyronine, involved in various bodily functions including metabolism. |
| T4 | Another thyroid hormone, also known as thyroxine, essential for metabolism and growth. |
| Thyroid Gland | An endocrine gland in the neck producing thyroid hormones, crucial for regulating metabolism, growth, and development. |
| Thyroid-stimulating hormone (TSH) | A hormone released by the pituitary gland that stimulates the thyroid gland to produce T3 and T4. |
| Thyrotropin-releasing hormone (TRH) | A hormone released by the hypothalamus that signals the pituitary gland to release TSH. |
| Parathyroid Glands | Small glands located behind the thyroid gland, important for regulating calcium levels in the blood. |
| Iodine | An essential element for the production of thyroid hormones, obtained from the diet. |
| Hypothalamus | A region of the brain that controls the pituitary gland and regulates hormones. |
| Pituitary Gland | An endocrine gland at the base of the brain that controls other glands in the body, including the thyroid gland. |
| Larynx | A structure in the neck containing the vocal cords and involved in breathing, speech, and protecting the trachea. |
| Trachea | A tube that connects the larynx to the lungs, allowing for air passage. |
| Goiter | An enlargement of the thyroid gland, which can be due to various causes including iodine deficiency or thyroiditis. |
| Papillary Thyroid Cancer | A common type of thyroid cancer, characterized by its slow-growing nature. |
| Inflamed Lymph Nodes | Lymph nodes that have become swollen and tender, often in response to infection or inflammation. |
