The thyroid gland is an endocrine gland.

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Multiple Choice

The thyroid gland is an endocrine gland.

Endocrine glands release hormones directly into the bloodstream to regulate distant targets. The thyroid fits this definition because it is ductless and its products—thyroid hormones (T3 and T4) and calcitonin—are secreted into the blood in response to TSH. These hormones control the body's metabolism, growth, and development. In contrast, exocrine glands secrete their products into ducts. Some people might think of the thyroid as just a gland, but its primary function is hormonal regulation throughout the body, confirming that it is an endocrine gland.

Endocrine glands release hormones directly into the bloodstream to regulate distant targets. The thyroid fits this definition because it is ductless and its products—thyroid hormones (T3 and T4) and calcitonin—are secreted into the blood in response to TSH. These hormones control the body's metabolism, growth, and development. In contrast, exocrine glands secrete their products into ducts. Some people might think of the thyroid as just a gland, but its primary function is hormonal regulation throughout the body, confirming that it is an endocrine gland.

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