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Thyroid Disorders

The thyroid is located below the larynx and anterior to the trachea (see Figure 4.3). The thyroid gland produces two iodine-dependent hormones: thyroxine (T4) and triiodothyronine (T3). A third hormone known as thyrocalcitonin (calcitonin) is produced by the C cells of the thyroid gland in response to calcium levels. The C cell makes calcitonin that helps to regulate calcium levels in the blood. These hormones play a role in regulating the metabolic processes controlling the rate of growth, oxygen consumption, contractility of the heart, and calcium absorption.

Figure 4.3. Thyroid and parathyroid glands.



  

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