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Endocrine System

Thyroid and Parathyroid Glands

What is a unique characteristic of the thyroid gland?

The thyroid gland is the only gland that is able to store its secretions outside its principal cells. In addition, the stored form of the hormones is different from the actual hormone that is secreted into the blood system. Enzymes break down the stored chemical prior to its release into the blood.



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