Definition: The term "atriocoelomic" refers to the structure of the thyroid gland. The thyroid is a gland that produces hormones that regulate metabolism and growth in the body. It is located at the back of the neck, just below the collarbone. The thyroid gland contains an array of tiny follicles called thyroid follicles, which produce hormones such as thyroxine (T4), triiodothyronine (T3), and thyrotropin-releasing hormone (TRH). These
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